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Devin_20208-Gravel
8-Gravel
January 28, 2026
Solved

Entering and Retrieving a Vector from an IF Statement

  • January 28, 2026
  • 1 reply
  • 248 views

Hello, I am trying to use an IF Statement to check one vector against another.  I would like to return the same value into a vector or an altered value depending on if the one vector's value at a row is above 0 degrees.  I have tried replacing Theta_0 with the value of 0 deg.  Either way I am getting an error that says the value must be a scalar.  Could someone help me figure out how to make this IF Statement function properly?

 

Devin_2020_0-1769593571351.png

 

 

V/r,

Devin

Best answer by Werner_E

Normally, when you intend to feed a vector into a function written for scalars you would use vectorization. But unfortunately comparison operators like "<" can't be vectorized in Prime.

Werner_E_0-1769598962630.png

So you must resort to other options.

One way uses vector indices to singly apply the if-function to each value

Werner_E_1-1769599040697.png

 

Another option uses a utility function and call it vectorized. While the comparison operation can't be vectorized directly, a function using the comparison operator can be called vectorized.

Werner_E_2-1769599189249.png

 

As in your case the goal is just to normalize the angles to be in [0, 360°) you could do without theta0 and use the mod function 

Werner_E_3-1769599282963.png

 

A more generic approach is

Werner_E_5-1769599451338.png

which would deal with angles lower than -360° as well.

 

1 reply

W
Werner_E25-Diamond IAnswer
25-Diamond I
January 28, 2026

Normally, when you intend to feed a vector into a function written for scalars you would use vectorization. But unfortunately comparison operators like "<" can't be vectorized in Prime.

Werner_E_0-1769598962630.png

So you must resort to other options.

One way uses vector indices to singly apply the if-function to each value

Werner_E_1-1769599040697.png

 

Another option uses a utility function and call it vectorized. While the comparison operation can't be vectorized directly, a function using the comparison operator can be called vectorized.

Werner_E_2-1769599189249.png

 

As in your case the goal is just to normalize the angles to be in [0, 360°) you could do without theta0 and use the mod function 

Werner_E_3-1769599282963.png

 

A more generic approach is

Werner_E_5-1769599451338.png

which would deal with angles lower than -360° as well.

 

    D
    Devin_20208-GravelAuthor
    8-Gravel
    January 28, 2026

    Werner,

     

    Thank you very much!!  I will use your first example of theta_11_1.   I appreciate you responding so quickly too!

     

    Sincerely,

    Devin

    W
    Werner_E25-Diamond I
    25-Diamond I
    January 28, 2026

    You are welcome.

    I forgot to mention that if you. like me, don't want you worksheet to be cluttered with range variables which are only used once, you may replace it by a programmed for-loop:

    Werner_E_0-1769600530492.png

     

    In your case also

    Werner_E_1-1769600631673.png

    would work OK but the method would fail for angles larger than 90° or angles in the range from (-90°,0)

     

    I guess I personally would rather prefer the last method in my previous sheet.

    You may define a utility function "normalize" at the top of the sheet, maybe in a collapsed area) and use it later that way

    Werner_E_3-1769601236175.png

    I consider it good style to use vectorization here in case a vector argument is used instead of a scalar, but in case of this function it would not even be necessary to vectorize.

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