Submitting User Inputs to Process. So, if an expression includes two or more operators, the operator higher on the list is applied first, then the second highest, and so on. In order to ensure an operation occurs before another, enclose it within parentheses. A variable identifies the data to use when evaluating an expression. It uses syntax similar to Microsoft Excel sheet! Appian variables are always of a specific data type. The variables you can use in an expression depend on the context in which the expression is designed and evaluated.
They are listed in the Data tab of the Expression Editor and include Appian variables and user-defined process variables. For a full listing or variables delivered with Appian, see Process and Report Data. Variables of complex and custom data types use the dot operator to access field values. You can also use the index function. You create a variable process variable, node input, or local variable called "personA" of type Person. To access the "firstName" value of the variable, enter any of the following:. Appian recommends using index to access the index value of a CDT in cases where the variable may have a null value, or the field name is not available.
The index function allows you to assign a default value through its default value parameter. The dot notation is useful when accessing nested fields of custom data type, provided that the nested field is not null. Local variables differ in that they are defined and set within the expression and are only available inside the last parameter of the function that defines them.
The with function defines a local variable and immediately assigns it a value. For example, in the following expression, local! Using with variables can avoid duplicating logic, make expressions easier to read, and avoid needlessly evaluating a part of the expression multiple times. The load function defines local variables for use in SAIL. Unlike with variables, load variables are set only once, the first time load evaluates, and afterward the value is only changed by SAIL interactions.
Local variable definitions that contain data queries may be evaluated in parallel to reduce the overall evaluation time. Some functions allow variables to be used in one or more of their inputs. These variables are in the fv! They are auto-suggested in expression editors and listed in the documentation for relevant functions. For example, the a! Because it is a function variable provided by the a! In this case, it is only provided for the expression parameter, so it cannot be used in the items parameter either.
For example, use the following expression to display a salutation when using process variables for the title and name data:. Comments are a way for designers to leave notes in the expression to explain what the expression does. Any content between these two symbols is ignored when the expression evaluates. Appian Functions, custom function plug-ins, rules, and data types are stored within the Appian system.
You can use Appian Functions, custom function plug-ins, and rules in expressions to perform operations using arguments you pass to them. The expression then returns a result based on your arguments. You can use data types in expressions to construct a complex data type value by creating a type constructor.
Arguments or fields within a type constructor that contain data queries may be evaluated in parallel to reduce the overall evaluation time. Functions and rules are defined by their logic and parameters. These parameters accept arguments that determine how the function will evaluate. For example, the user function retrieves the first name of a user using a process variable and a literal text as arguments through the following syntax:.
Passing arguments by position is required for Appian functions and custom function plug-ins and is best for rules that take three or fewer arguments. For example, the syntax for the joinarray function is the following:. You must enter values for every required argument in a function or rule or the expression results in an error. For rules, all inputs are required when passing by position. If not, the expression may apply the argument to the wrong parameter and result in an error or undesired results. Optional arguments are surrounded by brackets  in the function documentation.
For example, the toxml function has four parameters, three of which are optional. To use the default for [format] and [namespace] , but specify a value for [name] , you must also configure the [format] parameter. Some functions take an unlimited number of arguments, such as sum. This is denoted by an ellipsis in their function description with the Expression Editor. Passing arguments by keyword is only supported in system functions and rules.
It is best used for system functions and rules that take four or more arguments. To pass arguments by keyword, specify the name of the parameter, followed by a colon, then the argument value. A rule called feedMessageForNewCase returns the feed message for a case management application using the following definition:. It includes the inputs priority , caseSummary , and caseId.
All arguments are optional when passing by keyword. If you do not pass an argument for a parameter, the parameter receives a null value of the parameter type. The keyword or rule input name for a parameter is defined by the designer. They are searched first by the case-sensitive name, then case-insensitive, such that both rules below will evaluate:. If a keyword is not matched with a parameter name, the argument is ignored and the parameter receives a null value.
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Passing arguments by keyword is not supported when creating rules for the Web Content Channel, process reports, or events. If used, it will cause the process or task to pause by exception. For example, passing the sum function to the reduce function:. When using a function, rule, or data type in an expression, remember that function and rule names are NOT case-sensitive, whereas data types ARE case-sensitive. Specifying the namespace of the data type improves readability but is optional when the name of the data type is unique.
If the data type name is not unique, the system returns a validation error indicating the namespace must be specified. If you pass a rule, interface, or data type to an expression and the rule or data type is later deleted, the expression will still evaluate. If you inspect an import package, however, and it contains expressions that require the deleted rules or data types, the rules or data types will not be listed as missing precedents. To construct values for complex system and custom data types in an expression, create a type constructor. Type constructors accept an argument for each data type field and return a value of the specified data type.
Creating a type constructor is similar to passing arguments to functions except the domain is required for the type constructor to evaluate and data type names are case-sensitive. Entering the namespace of the data type is optional. If the name of the data type is unique, the namespace is looked up when the expression is saved and shown when the expression is viewed again.
If the data type name is not unique, the system prompts you to enter the fully qualified name including namespace when saving the expression. Remember to use single quotes around the full name since the namespace contains special characters. Appian recommends using keyword parameters with type constructors as shown in the above example to ease CDT change management.
When you save an expression that uses a data type value, and the data type is subsequently deleted, the expression continues to reference the deleted data type. For example, if the data type Person is deleted, the expression in the examples above will show up as the following:. The above is not the case, however, for all expressions. Expressions in third-party credentials and the following objects will not change upon type deletion because they always reference the latest version of a type:.
All arguments are optional in a type constructor. Fields that are not assigned a value are set to null. For fields that are themselves a complex data type, type constructors can be used to define their values. For readability when creating saving it as a rule, enter line breaks after each argument when passing by keyword. Type constructors are not supported when creating rules for the Web Content Channel, process reports, or events. In order to evaluate expressions faster, Appian automatically evaluates queries in parallel.
So instead of waiting for each query to evaluate one after another, independent queries will be evaluated at the same time if there are additional resources available, reducing the overall time it takes to evaluate the expression. This includes database queries, web service calls, custom plugins, and even Appian functions that query data stored within Appian. Queries are evaluated in parallel in any place where there's no way for one part of the expression to affect another part, such as:.
Of course, any parts of the expression that depend on a query will only be evaluated after that query is complete, thus ensuring that the result will be the same regardless of whether the expression is evaluated serially or in parallel. You may see this reflected in the performance view results for a particular interface. See the performance view page for more information on how to interpret performance results when an interface is evaluated in parallel.
Let's look an example to illustrate how it would be evaluated in parallel. Say you want to get the list of all account managers who don't currently have an active customer account. You may use an expression like the following:. When every part of this expression is evaluated serially, it looks something like this:. However, when there are resources available to evaluate queries in parallel, the evaluation would look like this:. All of this happens without making any changes to the overall expression; Appian can automatically detect which parts of the expression are independent and evaluate them in parallel to decrease the overall evaluation time.
Liked them a lot. This side of the island is as we first saw it approaching from the other side. The peaks are cloud covered. A 24 H run north to midday today of NM in variable easterlies. We received a very king send off yesterday. Breaking the voyage down helps a lot. Today will be spent keeping us moving in the wind shifts and strengths.
Yesterday evening close hauled on starboard we were reefed and flying the stay sail. Today we are under full sails trying to keep momentum. The expected wind shift is due tomorrow. The wind backs slowly northerly and then we will tack and head east as high as we can until the predicted westerly and south westerlies arrive sometime around Saturday. It will all change again for certain. Some of the SW winds look potentially quite strong.
We are sailing N over a flat sea in very light NE winds.
- Azores to Falmouth UK 1, NM – Samingo Sailing.
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And perhaps we motor this section? The wind will decrease to nothing here, so the grib maps tells me. A cup of tea. The engine will break the spell! Tea drunk the wind has made the decision. The wind virtually died. We are powering east at just under 6 knots in the hope of finding some wind this evening. We have covered NM through the water from Santa Maria.
This time last year when I set off alone from Stavanger I thought that nautical miles was a long way to sail alone to Scotland. My longer voyages of this sort of length have been with peoples. Off watch your sound asleep, as part of a crew, keeping yourself in good shape for your next watch. Off duty your senses can be rather more relaxed as part of a crew. I found, as a coastal, southern North Sea sailor I had always been thinking about arrival. On the way to Peterhead last year was the first time I did not think about arrival. We get there when we get there.
It was more enjoyable! Preparing for arrival became more thorough. There is no hurry. Twenty four hours out now and your nearly there. Before, 24 hours was a voyage! Sometimes, of course, you need to be as fast as you can to beat some weather.
I have a long way to go now over the coming days. A test of my comfort zone. I will be so pleased to get home safely with my ship but I do not wish it over. I will hopefully have a tiny bit of understanding of my friends, some of the best people I have ever met, who have sailed a very long way across the oceans. That did not last long. We are now close hauled on port in north easterlies errrrr heading for …. Four different grib maps show varying information. For the most part these winds should back eventually enough for us to lay a course north east.
Continuing as we were would have found us in no wind at all. On starboard the cabin slopes down to port and vice versa so now we are on port my equilibrium is being tested. As can gravity and the fridge. And which pilot berth to sleep in! A ship a ship. First traffic since the Azores. Anyone know where that is? Short for something in ship language. We are now on a course of 85 compass but airs are very light.
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Over the ground we have covered slightly more. A small lift from an ocean current helping us along. The wind is just east of north so we are close hauled on port. Over night we had a reefed main and stay sail. This morning the wind had backed slightly and we furled the stay sail and set the Genoa. Later the wind will veer again just east of North until at least Saturday which should hopefully have us approximately 43 N and 13 W. The wind is predicted to be slightly stronger. Got to be careful on deck in bare feet when the sun is out.
I could have burnt the soles of my feet. Out of nowhere yesterday a boat came towards us from our port quarter. AIS had us pretty much colliding. Only their MMSI number showed. As she got nearer it was definitely a fishing vessel. She passed half a mile in front of us! No reply on VHF. No sign of life. I woke a watch officer earlier in the afternoon.
My tomatoes are pretty much overdue so got to eat the whole supply soooon. My lovely green bananas have ripened as fast as the yellow ones. Out of them too now. But enough food on board to last several weeks. Loads of tinned fruit! Where is a Doc when you need one? Over the ground a bit more … NM. Just under hours underway. Wind shift at yesterday evening meant heading for Gibraltar!
Then it settled northerly.
They do look fickle and light. Last night was turbulent as we beat against variable wind strengths ending up at midnight with a couple of reefs in the main and flying the stay sail. I have some sleep to catch up on. We continue to sail on. Disappearing astern of us a squall, her skirts right down on the waves, our grey forbidding visitor is fleeing south. She brought 30 knot gusts as she came by.
Reefs have never been in so quick.
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Behind her, blue skies, a breath of breeze and a wind shift. NNW would you believe. We are now heading NE again but not for long. The wind veers back north, we could set the genoa and shake out the reef but there is more cloud heading this way and with the wind back up we are making 6 through the water with stay sail and a reef in the main. The ocean is punishing on a boat.
Days and days of non stop wear and tear. Parts being worked constantly, caked in salt water. It is so tempting to hoist full sail but being underpowered and nursing seems to be key. I find myself looking for weakness. Uncomfortable night bashing in to northerlies close hauled. But she does not get stopped. Tack and head NNW until wind backs and we resume course for the channel.
Thu, 12 Jul We were surrounded by squalls yesterday evening. Some could not be avoided although we did one, running away from it as it passed astern. The edge was windy enough. Full oilies on, rain. When it passed with darkness approaching I left the deep reef in and we forereached slowly, but comfortably, in to a messy sea state.
In to my pilot berth , out at midnight, a check around and then set an alarm for We still made 29 NM in the six hours. What did you say John P? In your email of yesterday! Two ships yesterday evening, one followed the other, both baring down on us from the north. If a squall appears red and menacing on the screen radar seems to set off a cacophony of alarm sounds. At some point in the next 24 hours we will tack on to starboard. My Mum, who gets these bulletins via Sally, will have to remind me who said that! The late Rod Taylor said it to one of his bodyguards. One was called Fred Hakim.
He ended up in a Nice prison accused of poking a moped rider in the eye. In fact it was RT himself who had done the deed and Fred took the hit for him. DT said that they let him out before filming ended though they were back in the UK by then. The sanitary arrangements in the Nice gaol left something to be desired.
Anyway Taylor had a tendency to stay up late. Your kindness and consideration I found to be golden. Thank you so much. It was a great pleasure speaking to you. It would be really cool if you sent an email to my wife. Really cool coming from you. Saying you have seen us. Fri, 13 Jul Yes the fish in Grand Banks was great, with nice weather for this moment a cyclone Chris is a menace for the fleet their. So the emails are checked, and of course I will send you wife and email and at least a picture due to slow speed broadband on board.
On the bridge of your ship! Am I right she is 80 metres? Did your watch officer see me visually, on radar or on AIS? The Bridge is obviously first class. On my log the officer registered an AIS target at 18 miles, target on radar S band at Late this morning I was watching a vessel approaching from astern. Eventually the name of the ship will appear on the screen. Out here in the clear air you see them in the distance very quickly. I called on 16 and got an immediate response. And then … can I help you with anything? Do you need a weather update?
Where were we heading etc. I asked if the fishing was good? They were returning to Vigo having been fishing in Newfoundland. The Captain sails boats so there was a common sympathy and I was talking to the Captain himself. Captain Alfredo Vilar knew exactly what I wanted. Of course of course. Your a solo sailor … I understand. Stay on your heading and leave everything to me. We have great controls on this ship. We chatted some more. Alfredo sailed from a small child. Slowly she came abreast on our starboard side. Can I call family to say where you are etc? I told him we had that sort of communication on board.
How cool is that to ask though? As her white superstructure and blue hull pulled away the Captain asked me for my route home and gave advice. I feel really chuffed with human nature. I met a really kind professional sailor today. Nothing was going to be too much trouble. A person who understood what those of us at sea share. I last experienced this casting off in Santa Maria. The look of concern, knowing what was ahead for us all setting off in to the sea. Back to a triple reefed main and stay sail slogging ENE to windward on port.
When to tack is the question.