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Where is the error in prompt function in this code?

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Batool Khader
Batool Khader 2019-4-5
回答： Walter Roberson 2019-4-5
for i= 1:4
disp (['enter an angle in degrees']);
x = input(prompt)
y(x) = cos (x);
plot (x,y);
end
y

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Walter Roberson
Walter Roberson 2019-4-5
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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