integer value error

[YA_10963798]

Can I know why this function is not working 

[ttokoro]

Your jx and jy are range. So you must select one of it by [0 or ^row(0).

However, Prime 10 shows bugs for these methods.

[YA_10963798]

I'm not sure if I understand what you are trying to say , Can you show me in the attached sheet 

I want to apply the atan function to all x and y values

[Cornel]

ttkoro the problem is here:

[Cornel]

Something like this, but as it is right now it is not taking into account the last element:

But anyway, as there in X' vector there are 2 consecutive elements for which that difference is 0, the obivious error divided by zero will be thrown.

[Cornel]

But if we change a little bit X' vector (these elements with yellow), in order at least the calculation to be possible for X':

Of course, the last element is not taken into account here. Maybe others can figure out how could be done in order to include also the last element in calculation (7.395 9.225)

[Cornel · Accepted solution]

And I do not know why there are that many elements in the calculation, as we have only 10 elements in X' and Y'

[YA_10963798]

Thank you for your help I appreciate it 

[Cornel]

My answer is not yet fully. I said this already, the last element is not taken into account, and I have a doubt why there are so many elements calculated: 
This difference is not calculated:

And there are many elements in below calculation, and I do not know if this is ok or not, as you have only 10 elemets in X' and Y'

[ttokoro]

Index of Y and X is not integer number but using Range to Vector undocumented technique. But Prime 10 delete the undocumented technique.

So, we must make vector to use [i element operator. 80 means using undocumented technique for untill Prime 9.

[Werner_E]

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@Cornel wrote:

And I do not know why there are that many elements in the calculation, as we have only 10 elements in X' and Y'

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That's because you are using two separate range variables to index X' and Y'. Each range runs from 0 to 8 and so you get a data structure with 9*9=81 entries because each X' difference is combined by each Y' difference.

This structure isn't a range and it isn't a vector. Actually its an invalid object. You can see that when you try to assign it a variable - it will fail.

BTW, the division by zero can be avoided by using the atan2 function so you get the 90 degree instead of an error 😉

The additional benefit of using atan2 is that we correct values for the full range from -180° to +180°

Here an attempt

Prime 9 sheet attached

[MartinHanak]