How to evaluate a math function?

Question

Nicolas Heumann 2019-6-16

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https://ww2.mathworks.cn/matlabcentral/answers/467360-how-to-evaluate-a-math-function

回答： Image Analyst 2019-6-16

采纳的回答： Image Analyst

I need to plot a 100 points for a math function, which is:

mu= 0.14-0.04*x;

I wish to use a 0.01 interval.

I believe that first I must store the values in an array, using a for loop. However, I can't seem to be able to evaluate the function, because whenever I type "mu(1)" in the command window I get "0.14" rather than "0.1". Other times, I just get "0.14-0.04*x"

How can I do this?

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Answer 1

Image Analyst 2019-6-16

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https://ww2.mathworks.cn/matlabcentral/answers/467360-how-to-evaluate-a-math-function#answer_379427

在 MATLAB Online 中打开

Try this:

% Specify the start of the interval.
x1 = 1;
% The end of the interval is 0.01 after the start of the interval.
x2 = x1 + 0.01
% Make 100 points between x1 and x2
x = linspace(x1, x2, 100);
% Make the function
mu = 0.14 - 0.04 * x;
% Plot it
plot(x, mu, 'b-');
grid on;
xlabel('x', 'FontSize', 20);
ylabel('mu', 'FontSize', 20);