Re: [expr ] help needed

Are you by any chance updating x before running the y calculation? If 
you do that, y will be
calculated using the updated x and not the correct (original) one.

cheers
Miller

On 11/29/25 6:49 AM, Hrvoje Radnic via Pd-list wrote:
> Dear group,
>
> I cannot figure out why the calculations inside
>  [expr (x*cos(theta))-(y*sin(theta));
> (x*sin(theta))+(y*cos(theta))] gives me wrong results.
>
> The above mentioned formula for rotation is correct. I initialize the 
> values through [value] object before preforming computation. The 
> initial values are: x=1, y=0, theta=1/2pi. I expect  the new x and new 
> y to be (0,1) respectively after the rotation. But, for some reason, I 
> get (-1,1). I checked the help files for [value] and [expr] and it 
> looks like I am doing everything right.
> Anyone have an idea where's the mistake?
> Thank you!
> Hrvoje Radnic
>
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