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Conversion to double from sym is not possible

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Tyler
Tyler 2011-11-14
回答： Shahid Iqbal 2019-6-30
syms n;
t = (-300:1:300);
D_n = ((sin((pi*n)/2))./(pi*n));
y = (D_n).*exp((-j)*n*t*(pi/100));
x = symsum(y,n,-10,-1) + symsum(y,n,1,10);
plot(t,x);
I would like to plot t vs. x, however I get the error 'Conversion to double from sym is not possible'.
  1 个评论
Christopher Creutzig
Christopher Creutzig 2011-11-17
Works fine for me. Are you using exactly the commands listed above? Which MATLAB version are you using? What does symvar(x) tell you?

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回答（2 个）

Walter Roberson
Walter Roberson 2011-11-14
Your x is a formula in terms of n, a variable you do not define a value for at any point.
Your t value has nothing to do with n.
You cannot plot a symbolic expression against an unrelated variable.
Perhaps what you want is
plot(t, double(subs(x,n,t)))
Shahid Iqbal
Shahid Iqbal 2019-6-30
syms n;
t = (-300:1:300);
D_n = ((sin((pi*n)/2))./(pi*n));
y = (D_n).*exp((-1i)*n*t*(pi/100));
x = symsum(y,n,-10,-1) + symsum(y,n,1,10);
plot(t,x);
work properly just replace -j with -1i , use updated version of MATLAB.

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