drawellipse not working, can't reproduce example

I am trying to use the function drawellipse.

I have tried to reproduce the example with the Llama image in the help section but I get an error :

imshow(imread('llama.jpg'))
h = drawellipse('center',[50,50])

Undefined function 'cos' for input arguments of type 'char'.

Error in drawellipse (line 22)

[cos(elpar(o,3)) sin(elpar(o,3)); % rotate over phi

How could I be doing something wrong if I'm literally copying the example?

Answer 1

[Sean de Wolski]

which -all drawellipse

Looks like you're shadowing this.

[Yahav Rave]

Yes you were absolutely right, I had another function with the same name. Afterchanging that, the example now works.

Thanks all!

[Image Analyst]

Strange. That may be. You may have had your own drawellipse() function, but why did it complain about the cos() function?

[Sean de Wolski]

They were calling their drawellipse() function with the syntax MathWorks' one expects. So the inputs didn't line up and got propagated to cos().

Answer 2

[Image Analyst]

What does this show

>> which -all cos

You should see

built-in (C:\Program Files\MATLAB\R2019b\toolbox\matlab\elfun\@double\cos) % double method

built-in (C:\Program Files\MATLAB\R2019b\toolbox\matlab\elfun\@single\cos) % single method

C:\Program Files\MATLAB\R2019b\toolbox\nnet\deep\@dlarray\cos.m % dlarray method

C:\Program Files\MATLAB\R2019b\toolbox\parallel\parallel\@codistributed\cos.m % codistributed method

C:\Program Files\MATLAB\R2019b\toolbox\parallel\gpu\@gpuArray\cos.m % gpuArray method

If you DON'T, then try this

> restoredefaultpath

and try the example again.

[Yahav Rave]

>> which -all cos
built-in (C:\Program Files\MATLAB\R2019a\toolbox\matlab\elfun\@double\cos)  % double method
built-in (C:\Program Files\MATLAB\R2019a\toolbox\matlab\elfun\@single\cos)  % single method
C:\Program Files\MATLAB\R2019a\toolbox\symbolic\symbolic\@sym\cos.m         % sym method

I get this response even after runing restoredefaultpath , and the example still fails with the same error.

[Image Analyst]

It works for us. I just copied and pasted your code and it worked fine. As expected with no error. You should call tech support. You didn't assign cos to something in your script before you ran those lines, did you? Try putting that "which" in your script just before the call to drawellipse and see if there is an extra cos that shows up, like it would if you defined cos in your code somewhere. If not, call tech support and let us know how they resolved it.

[Sean de Wolski]

Probably drawellpise itself, I doubt MW functionality would be algorithmic by line 22.