MATLAB: How to plot a function with a matrix

functionmatrix

For an exercise at school, I'm trying to plot a function where the variable is a matrix. The function is very simple: y=x^4 The matrix, x, is 0:0.01:20 so it has a range from 0 to 20, and there are 2000 between them. My problem is, the scale of the x-axis is 0-2000, and not 0-20 as i'd suppose it to be. According to the current graph: 1000^4=10000, while it should be: 10^4=10000. What am I doing wrong?

Best Answer

I suspect youâ€™re just plotting y, not x as well. Itâ€™s always a good idea to plot both your independent and dependent variables in order to understand your data.

See if this produces the plot you want:

x = 0:0.01:20;
y = x.^4;
figure(1)
plot(x, y)
grid

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I am not certain what you want as the result.

Try this:

M = rand(32,24) + (1:24);                       % Create Matrix
x = 1:32;                                       % Independent Variable Vector
figure
for k = 1:3
    subplot(3,1,k)
    plot(x, M(:,(1:8)+(k-1)*8))
    grid
end

Substitute your own matrix for ‘M’, and your independent variable vector for ‘x’.

Best Answer

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