Is it possible to assign a global variable at run time?

nophead wrote

If you are passing a lot of variables around perhaps it is better to put
them in a list and just pass that. For example when I define something like
a parametric box I put the properties in a list and pass it to all
functions and modules that draw the box.

LenStruttmann wrote

Alternatively, you can create a module that contains a function that
returns your six values.  For example, put:

function mySixValues() = [ 1, 2, 3, 5, 6, 7 ];

...in a file called myGlobalValues.scad

Then, in each module that needs those value, put:

//*******************************
use <myGlobalValues.scad>;

myValues = mySixValues();

echo( myValues );

lar3ry wrote

OK. I really didn't think it could be done, but thought I'd ask anyway.

So I decided to pass the variables as a list, and that's acceptable.

However, I have a problem, related to the whole "variables aren't" thing.
When I test for a valid formula, I can detect whether or not it's valid, but
I can't figure out how to pass it out of the for, so I can check for it in
the assert(), and use it in the call to calc(formula,given);

Is there some way I can store the true or false externally to the for loop,
so I can fetch it later?
Or is there perhaps some way I can break out of the for loop if I find a
match?

valid_formula = ([13,23,43,15,25,45,16,26,46,31,32,
                                34,51,52,54,61,62,64,71,72,74]);

triangle (20,30,0,50,0,0); //generates formula 64

module triangle(A,B,C,a,b,c) {
        given = [A,B,C,a,b,c];
        angflag = ((A>0 ? 4 :0) + (B>0 ? 2 :0) + (C>0 ? 1 :0)) * 10;
        sideflag = ((a>0 ? 4 :0) + (b>0 ? 2 :0) + (c>0 ? 1 :0));
        formula = angflag+sideflag;
        for (f = [0:20]) {
                if (formula == valid_formula[f]) {
                        echo ("formula: ", formula, " is valid");
                }
        }
// assert(valid==true, "Invalid input. Must have 2 angles and 1 side, two
sides and 1 angle, or three angles and 1 side");
       
echo (given);
// Note that in we only need to solve for side b and side c because once we
have those, we can simply close the path
// calc(formula,given);
}




nophead wrote
> If you are passing a lot of variables around perhaps it is better to put
> them in a list and just pass that. For example when I define something
> like
> a parametric box I put the properties in a list and pass it to all
> functions and modules that draw the box.





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adrianv wrote

You just want to know if formula is in the list valid_formula?  Why not use
search?  
Something like search([formula], valid_formula)[0] != [].  

Might double check syntax, or use BOSL2 in_list() instead to avoid idiotic search()
syntax.  

    A= 30;
                b= 25;
                c=  40;
                a =sqrt(b^2 + c^2 - 2 * b * c * cos(A));
                echo ("line 56 ",A,B,C,a,b,c);

works, I guess a given value is wrong.

Thanks! Got another problem with a formula. Here's a snippet

        if (formula==43) {
                A=given[0]; // 30
                b=given[4]; // 25
                c=given[5]; // 40
                a =sqr(b^2 + c^2 - 2 * b * c * cos(A));
                echo ("line 56 ",A,B,C,a,b,c);

and the result of the echo is:
ECHO: "line 56 ", 30, 0, 0, 242999, 25, 40

The answer should be 22.20 according to the http://cossincalc.com site.

    nophead wrote
    If you mean sin to the -1 it means arcsine, which is asin() in openscad.
    I.e. the inverse of sin.

    > What the heck does the '-1' in that formula mean?

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mondo wrote

    A= 30;
                 b= 25;
                 c=  40;
                 a =sqrt(b^2 + c^2 - 2 * b * c * cos(A));
                 echo ("line 56 ",A,B,C,a,b,c);

works, I guess a given value is wrong.


On 10/05/2021 22:20, lar3ry wrote:

> Thanks! Got another problem with a formula. Here's a snippet
>
>         if (formula==43) {
>                 A=given[0]; // 30
>                 b=given[4]; // 25
>                 c=given[5]; // 40
>                 a =sqr(b^2 + c^2 - 2 * b * c * cos(A));
>                 echo ("line 56 ",A,B,C,a,b,c);
>
> and the result of the echo is:
> ECHO: "line 56 ", 30, 0, 0, 242999, 25, 40
>
> The answer should be 22.20 according to the http://cossincalc.com 
> <http://cossincalc.com> site.
>
>     nophead wrote
>     If you mean sin to the -1 it means arcsine, which is asin() in
> openscad.
>     I.e. the inverse of sin.
>
>     > What the heck does the '-1' in that formula mean?
> ------------------------------------------------------------------------
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> <http://forum.openscad.org/> at Nabble.com.
>
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LenStruttmann wrote

The square root function is sqrt().  You've got sqr().