MATLAB stem function error

Whenever I run any program which includes stem function I got this error and it never plot the graph.

[Image Analyst]

Like I just told someone else a minute ago:

I don't know. MATLAB cannot convert your image into code. Attach your code so we can run it. Make it easy to help you not hard.

TUTORIAL: How to ask a question (on Answers) and get a fast answer

Answer 1

[Star Strider]

Either just use ‘z1’, or use a ‘shape’ argument with conv:

n = -15:15;
u = n>=0;
u1 = n>= 4;
f = u-u1;
z1 = conv(f,f,'same');

figure
stem(n, z1)

.