error when plotting function

Question

Gavin Seddon 2016-11-22

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/313454-error-when-plotting-function

评论： Gavin Seddon 2016-11-23

hello, when i give this function i get the following error will someone please correct me ?

>> fplot(@(a1*sin(b1*x+c1) + a2*sin(b2*x+c2) + a3*sin(b3*x+c3) + a4*sin(b4*x+c4),[0,4000]) fplot(@(a1*sin(b1*x+c1) + a2*sin(b2*x+c2) + a3*sin(b3*x+c3) + a4*sin(b4*x+c4),[0,4000]) ↑ Error: Unexpected MATLAB operator.

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Answer 1

Torsten 2016-11-22

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https://ww2.mathworks.cn/matlabcentral/answers/313454-error-when-plotting-function#answer_244286

在 MATLAB Online 中打开

Did you read the documentation ?

a1=...;
a2=...;
a3=...;
a4=...;
b1=...;
b2=...;
b3=...;
b4=...;
c1=...;
c2=...;
c3=...;
c4=...;
fplot(@(x)(a1*sin(b1*x+c1) + a2*sin(b2*x+c2) + a3*sin(b3*x+c3) + a4*sin(b4*x+c4),[0,4000])

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Gavin Seddon 2016-11-23

your command failed due to missing bracket. however now this produces a chaotic graph rather than a function will you help? i have been using matlab help, where should i look >> fplot(@(x)(a1*sin(b1*x+c1) + a2*sin(b2*x+c2) + a3*sin(b3*x+c3) + a4*sin(b4*x+c4)),[0,4000])

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