error about "signal(...) " and "signal.m"

My Prof. give me a code which include something like "signal(...)" but it causes error in my computer. we compared our doc.s and saw that we have same "signal.m" with same content. I reload signal process toolbox but it did not work. anyone have any recommend?? thanks.

Answer 1

[Walter Roberson]

On the professor's machine, in MATLAB give the command

which signal

If signal() turns out to be part of a toolbox, then the directory reported will hint at the toolbox.

[MUJDE]

Ok. sr. i will try this and share the result here. thanks