Undefined function 'Qc' for input arguments of type 'double'. What's wrong with my function?

Not sure what's happening here. I was checking documentation for a while and can't seem to find a solution. Here is my function:

 function Q = heatc(c1,m1,t1,t2)
 Q = c1.*m1.*(t2-t1);
 end

Then when I call it I get the following error:

 EDU>> y = heatc(4190,0.185,20,100)
 Undefined function 'heatc' for input arguments of type 'double'.

Not sure what's up, isn't every variable automatically of type floating point double.

[dpb]

A. Did you name the file containing the source heatc.m?

B. Remember that Matlab is case-sensitive while the OS may or may not be.

C. Is the subdirectory in which you created the m-file on the Matlab search path?

are the most obvious causes to investigate first.

[Ryan]

Issue was C. Thought I was in the search path. Thanks.