NxN Matrix with sinusoidal element values

2015 4 29
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更新时间：2015 4 30
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I would like to create an N x N matrix with its entries to have values in a shape of a sinus curve when ploted. E.g.: let's take an arbitrary number for the first entry value of the first row. The second value is increased and so on, until the values drop again to a minimum, from which entry on they go up again and so on and so forth...until the N-th entry is reached. This is for the rows. For the column entries I would like to have the same. How can this be achieved?

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Star Strider
Star Strider 2015-4-30

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I am not certain what you want. This takes the sin function on the x and y values separately:
x = linspace(0, 4*pi);
[X,Y] = meshgrid(x);
Z = sin(X) + sin(Y);
figure(1)
surf(X, Y, Z)
grid on

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Joseph Cheng
Joseph Cheng 2015-4-29
编辑：Joseph Cheng 2015-4-29

2 个投票

well you'd just plot row 1 like you would a sinusoid.
x = [1:100];
y = sin(2*pi*x/6);
then repeat row 1 to make it NxN or in my example 100x100
NxN = repmat(y,100,1);
to make first entry random just choose random starting number for x

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Lucius
Lucius 2015-4-30
But in this way the matrix will look like stripes, won't it? What I intended was to have a sinus curve in row, as well as in column. So the matrix would look like mountains and valleys regularly located all over the matrix.
Joseph Cheng
Joseph Cheng 2015-4-30
Then i misread your last statement. then just create a meshplot and perform a 3d surface sine wave.
x = [1:100];
[x y] = meshgrid(x,x);
z = sin(2*pi*x/30).*sin(2*pi*y/30);
surf(z)
Lucius
Lucius 2015-4-30
I would accept this answer, too, if only the accept button was visible here. Thank you very much!
Star Strider
Star Strider 2015-4-30
@Lucius — I voted for it, so Joseph gets the same number of points.

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