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clear clc eta = 100; a= 0; xi=0.016; axis([0 0.01 0 1.1]); x = 0:0.0001:0.01; N = -a+1.6*(1/(xi*eta)); y=N; plot(x,y,'LineWidth',2); set(gca,'FontSize',10);

Hi. I'd like to plot the function $N(x)$ (indeed, constant), on MATLAB, but the code above does not return any line on window. Why? Many thanks!

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3 Answers

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I like to write it

y=N+0*x;

Matlab automatically creates the array with the correct length. And, since you are multiplying it by 0, you create essencially a constant vector.

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If you wanted to create an array of ones then you could do

y=ones(size(x));

or write

clear; clc; eta = 100; a= 0; xi=0.016; axis([0 0.01 0 1.1]); x = 0:0.0001:0.01; temp = ones(size(x)); N = temp.*(-a+1.6*(1/(xi*eta))); y=N; plot(x,y,'LineWidth',2); set(gca,'FontSize',10);

Though, it is extremely unclear why you are writing

N = -a+1.6*(1/(xi*eta));

when you could just write

N = 1;

or just make an array of ones and write

clear; clc; eta = 100; a= 0; xi=0.016; axis([0 0.01 0 1.1]); x = 0:0.0001:0.01; y = ones(size(x)); plot(x,y,'LineWidth',2); set(gca,'FontSize',10);
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Y and X should be the same size: y = N*size(x)

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