Indexing error in functions (while- and for loops)

Bram_Weinreder1 · June 3, 2015, 2:33am

Browsed the first page of most recent posts but this doesn’t seem to be a big issue…

I’m now at a point where I master some Dynamo functions in designscript, so code rather than the input/output blocks, and try to use functions wherever I have to repeat a few lines of code. But since a little while, I keep getting an indexation error whenever I use a while() loop and try to put the result into a list. I’ve tried the most common steps to find the error, but it drives me nuts to have to close and re-open the file every time.

So this is basically how I learned it: I first declare i = 0, then start a loop to test the value of i against another parameter. It increases at the end of each loop (i = i + 1) (by the way… whatever happened to i++?) but before that I put the result into a collection (list[i] = result).
The error occurs at the last step, when I’m using i as an index for the returned list. My best translation from Dutch: ‘The index is outside the range. It cannot be negative and must be smaller than the size of the collection.’

Here’s a quick sample in which I try to generate ten panels of 600 by 1000 units:

def PlacePanels(midpoint)

{
surfaces = {};

startpoint = midpoint;
vector = Vector.ByCoordinates(1, 0, 0);
vecPerp = vector.Rotate(Vector.ByCoordinates(0, 0, 1), 90);
path;
profile;
surface;

i = 0;

return = [Imperative]
{

while (i < 10)
{
path = Line.ByStartPointDirectionLength(startpoint, vector, 600);
profile = Line.ByStartPointDirectionLength(startpoint, vecPerp, 1000);
surface = Surface.BySweep(path, profile);
surfaces[i] = surface;

i = i + 1;
startpoint = path.EndPoint;

}
return = i;
}
};

The same happens in a for() loop:

def PlacePanels(midpoint)
{
surfaces = 0…9;

startpoint = midpoint;
vector = Vector.ByCoordinates(1, 0, 0);
vecPerp = vector.Rotate(Vector.ByCoordinates(0, 0, 1), 90);
path;
profile;
surface;

return = [Imperative]
{

for(surface in surfaces)
{
path = Line.ByStartPointDirectionLength(startpoint, vector, 600);
profile = Line.ByStartPointDirectionLength(startpoint, vecPerp, 1000);
surface = Surface.BySweep(path, profile);
startpoint = path.EndPoint;

}
return = surfaces;
}
};

Does anyone have a clue what’s causing this, or how to fix it? I’m starting to run out of options here.
Kind regards, Bram

Bram_Weinreder1 · June 3, 2015, 2:42am

Here’s the code again but without the annoying formatting…

def PlacePanels(midpoint)
{
surfaces = {};

startpoint = midpoint;
vector = Vector.ByCoordinates(1, 0, 0);
vecPerp = vector.Rotate(Vector.ByCoordinates(0, 0, 1), 90);
path;
profile;
surface;

i = 0;

return = [Imperative]
{

while(i < 10)
{
path = Line.ByStartPointDirectionLength(startpoint, vector, 600);
profile = Line.ByStartPointDirectionLength(startpoint, vecPerp, 1000);
surface = Surface.BySweep(path, profile);
startpoint = path.EndPoint;

surfaces[i] = surface;

i = i + 1;

}
return = surfaces;
}
};

Bram_Weinreder1 · June 3, 2015, 4:23am

Yay, this sorted itself out by downloading and installing the latest build (0.8.1.1530).

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Indexing error in functions (while- and for loops)

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