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+--- Thread: Return a vector from a function? (/thread-4306.html)
Return a vector from a function? - norlesh - 07-06-2015 12:55 AM
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.
RE: Return a vector from a function? - norlesh - 07-06-2015 07:44 AM
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?
RE: Return a vector from a function? - Didier Lachieze - 07-06-2015 09:45 AM
Here is a way to return a vector from a User Defined function (a bit cumbersome but it seems to work…):
[attachment=2273]
But in your case it's much more simpler to use the existing rectangular_coordinates() function:
[attachment=2274]
RE: Return a vector from a function? - DrD - 07-06-2015 10:21 AM
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!
RE: Return a vector from a function? - norlesh - 07-06-2015 12:00 PM
Thanks to both of you for the solution and pointing out the built in function.