What's the problem with this simple anonymous function?

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Muhammad Usman 2021-11-10

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1583474-what-s-the-problem-with-this-simple-anonymous-function

评论： Muhammad Usman 2021-12-7

Here's an simple code:

clear all; clc; close all;
n = 1:3;
for i = 1:numel(n) %numel is used if someother time I'll use negative values for n
    f = @(x) x.^n;
    fplot(f);
    hold on;
    f1 = @(x) x.^(1/n);
    fplot(f1);
    hold on;
end

The function "f" is running OK but "f1" is generating graphics error. For one value of n like:

f1 = @(x) x.^(1/2);

It generates the plot, but not in the loop.

Please let me know what's wrong?

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Answer 1

Steven Lord 2021-11-10

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You likely meant to use n(i) in your functions, not n. Another option would be to use 1./n instead of 1/n.

n = 1:3
n = 1×3
     1     2     3
y = 1./n
y = 1×3
    1.0000    0.5000    0.3333
z = 1/n(2)
z = 0.5000
w = 1/n
Error using /
Matrix dimensions must agree.

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Muhammad Usman 2021-12-7

Thanks, sometimes a simpler logic never clicks into the mind

Muhammad Usman 2021-12-7

One thing more to ask how to adjust legend for array n

n = 1:10;
    figure(1);
    f = @(x) x.^n;
    fplot(f);
    hold on;
    legend(sprintf('$x^{%d}$\n',n),'Interpreter','latex');
    xlim([0 10])
    