I am using the Line (programming) function for a calculation.

Firstly, apologies, I cannot get the line function to display as maths in the forum so I have had to bodge it in with some text.

Say I have a line function like this:

a:=1
b:=2

|c:=b^2+2 . . = 7
|c
|a+c

Then I would like to be able to display the result of 'c' in the line function. The variable scope of c is limited to within the line function (which is good), but it means I cannot see the value.

So it would look something like this:

|c:=b^2+2 . . = 7
|c = 6
|a+c

I have attached a worksheet showing this in more detail.

Thanks in advance

Additional Programming Result.sm (15kb) downloaded 11 time(s).

Also, wrapping the block in eval() makes all variables global. This doesn't even require assignment or display operators.
In fact, you also could use other structures like lists { or matrices [] to collect definitions. Yet, only the line operator warrants a certain sequence of execution.

Edited by user 26 July 2023 03:53:58(UTC)  | Reason: Not specified

I don't know how to localize variables, but know how to "globalize" them. For a more elaborate selection about which variables you want outside of a function body, you can redefine inside it the functions arguments, like this:



Best regards.
Alvaro.

Thanks Alvaro,

Can I just check what you have done. I assume that above the maths you have shown in your post, you have separately defined xo:=5, y:=7 etc. Therefore xo, y and ao are global variable after f() because they were global beforehand? Or have I missed something?

Alvaro,

I didn't know you could pass variable by reference, rather than by value, into a function.

I think that is a solution to the problem. It also has the advantage that it can insert all the variables into global scope in one go.

For completeness I have added your method to the my example worksheet, and also upload a second worksheet ( "Section Properties" ) so the calculation can actually be done. The "path" variable should automatically point SMath at the directory where "Additional Programming Result 2.sm", so it will find "Section Properties.sm" providing they are both saved in the same directory. If not then the path variable can be adjusted to suit.


Alvaro, many thanks once again for your help with this

Additional Programming Result 2.sm (22kb) downloaded 18 time(s).
Section Properties.sm (4kb) downloaded 15 time(s).

Edited by user 26 July 2023 07:51:02(UTC)  | Reason: Marked as solved

I am trying to think simple.
Maybe sys() is what you looking for.

Hi. Pushing Martin's solution one little step further.

Blatt22 ver 2.sm (19kb) downloaded 9 time(s).
Blatt22 ver 2.pdf (83kb) downloaded 11 time(s).

Best regards.
Alvaro.

Thanks Martin,

Your implementation is simpler than mine. The reason I went for a slightly more complex version was to reduce the possibility of errors.

For example, if you have a function that computes the second moment of area of a box girder then you would be listing lost of dimensions in the function definition with similar names all in the same units, for example:

SecondMomentOfAreaBoxGirder(w.tf, t.tf, w.bf, t.bf, d.wb, t.wbr, t.wbl, a.wbr, a.wbl)

Getting one of these around the wrong way may have a significant effect on the result, but be hard to spot. If they are listed in the line function, as I have done, then the order is not important, so one way of generating errors is removed.

The reason I want to use included sheets for this is because some of the functions were becoming very long and a little unwieldy. For complex functions, I find having a worksheet become a function a simpler way to do things, but there are instances where a simple function would be easier.

As above, having more options is good. So thanks again, Martin.

Jean,

I'm sorry, I don't understand what you are trying explain. Would you be able to provide some additional details, please?

Thanks,
Peter

Here is a easy way to get a summary for procedural implementations of algorithms. You just insert a table region, write your function to the placeholder and do some format adjustments. In the example I just switched from fixed to variable width of table columns and set the font to arial.

Unfortunately, the decimal separator setting is not respected.

This procedure has full control over units in results display and can be extended to alvaros generalized approach (with then input and output flags being dynamic).

Blatt22.sm (13kb) downloaded 11 time(s).