Plot of a function

Question

Saptarshi Bhattacharjee 2012-1-2

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https://ww2.mathworks.cn/matlabcentral/answers/25101-plot-of-a-function

I have a problem where I need to plot the curve of f(x) vs x.x=[0,4]. I am having problems as to dealing with the multiple outputs of f(x). Is there a way of accessing each element of x as in arrays and then compute the value of f(x) for that x and store it in another array? Finally i can plot the curve with help of values in x and f(x) vectors

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Walter Roberson 2012-1-2

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Answer 1

Walter Roberson 2012-1-2

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https://ww2.mathworks.cn/matlabcentral/answers/25101-plot-of-a-function#answer_32964

在 MATLAB Online 中打开

numx = length(x);
fx = zeros(1, numx);
for K = 1:numx
  fx(K) = f(x(K));
end
plot(x, fx);

However, keep in mind that

x = [0,4];

constructs x to have exactly two values, 0 and 4. There is no MATLAB construct to express a continuous range of values. You can use the colon notation to express lists of values, such as

x = 0 : 0.1 : 4;

or you can use linspace(), such as

x = linspace(0, 4, 51);

where the 51 is the total number of points including the two endpoints.