MATLAB: Where is the error in prompt function in this code

prompt

for i= 1:4
    disp (['enter an angle in degrees']); 
    x = input(prompt)
    y(x) = cos (x); 
    plot (x,y); 
end 
y

Best Answer

prompt is not a defined variable. Perhaps you should have used
prompt = 'enter an angle in degrees: ';
Note that your prompt talks about degrees, but cos() works in radians. cosd() works in degrees.
Your code would work (not crash) if the user happened to enter a positive integer, but what if the user happened to enter 0 or negative? y(x) when x is 0 would be a problem.
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