Return a vector from a function?

[norlesh]

How can I create a user defined function to map two variables into a vector on the prime?

i.e. something along the lines of:

defvect(angle, magnitude):=[magnitude*cos(angle), magnitude*sin(angle)]

but that works.

[norlesh]

OK so I solved my task by making it a program

Code:


EXPORT DEFVECT(mag,ang)
BEGIN
   RETURN([mag*COS(ang),mag*SIN(ang)]);
END;

But that really feels like tapping an exposed nail head with a sledge hammer. Is there no way to return a vector or matrix from the 'Define' window?

[Didier Lachieze]

Here is a way to return a vector from a User Defined function (a bit cumbersome but it seems to work…):

   

But in your case it's much more simpler to use the existing rectangular_coordinates() function:

   

[DrD]

By using a list first, try this function, which will create the variables M0, mag, and ang. (Uncheck the [M0]):

[Shift] [Define]
NAME: defvect
Function: M0:=list2mat({mag*COS(ang), mag*SIN(ang)})

M0:[ ] mag:[ ✔] ang:[ ✔]

oops, I see Didier beat me to it!

[norlesh]

Thanks to both of you for the solution and pointing out the built in function.