Type Error in Python function

Question

I'm working a small program that calculates the trajectory of an object fired on certain planetary bodies, then plots them with Turtle graphics. Currently, I'm stuck on an issue with a Type Error that I can't seem to figure out.

So, here is the stack:

Traceback (most recent call last):
File "MY FILEPATH", line 174, in <module> main()
File "MY FILEPATH", line 153, in main
    x1,y1 = xtoy(dist(velo,ang,grav),velo,ang,grav,i)
File "MY FILEPATH", line 66, in xtoy
    sety = int(dist*tan(ang)-(grav*dist**2)/(2*velo**2*cos*((cos(ang)))))
TypeError: unsupported operand type(s) for *: 'int' and 'builtin_function_or_method'

and here is a pastebin of the code.

http://pastebin.com/aY0fhGEV

I am absolutely stumped, and have been wracking my brain for a week. Any help would be truly appreciated.

BrenBarn · Accepted Answer · 2012-10-06 05:44:54Z

3

You have 2 * cos. This is trying to multiply the number 2 times the function cos. You need to take the cosine of something in the second part. Perhaps you meant 2*cos(ang)*cos(ang)?

answered Oct 6, 2012 at 5:44

BrenBarn

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1 Comment

Chris Wesseling Over a year ago

@user1724602 The same goes for your own functions like dist.

RocketDonkey · Accepted Answer · 2012-10-06 05:46:19Z

1

You have an extra * after the second to last cos, which treats it like a built-in instead of evaluating an argument.

answered Oct 6, 2012 at 5:46

RocketDonkey

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