What is the meaning of symbol “.”in this code
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I was watching a tutorial today on graphics, and one line of code went like this.
x = linspace(0,3); y = x.^2.*sin(x); plot(x,y);
What does the sign "."? Does it have any specific meaning?
Thank you all.
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Accepted Answer
Jan
on 16 Mar 2022
Edited: Jan
on 16 Mar 2022
While ^ is the power operation, which acts on the complete array, .^ is the elementwise power. For a scalar, this is no difference:
a = 17;
a ^ 2 % 289, same as a * a
a .^ 2 % 289, same as a * a
a = [2, 3];
a ^ 2 % ERROR, same as [2, 3] * [2, 3] - this is not defined
a .^ 2 % [4, 9], same as [2^2, 3^2]
% And equivalent to: a .* a
The power operator ^ is defined for square matrices only.
The same for .* : * multiples the arrays, while .* operates on the array elements.
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