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Nothing on my plot is showing up, anyone know why?

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Luke Radcliff
Luke Radcliff 2016-5-31
评论： Luke Radcliff 2016-6-1
figure(1);
clf;
x = [linspace(50,100,1000) linspace(0,50,1000)];
z = -x(1).*x(2).*exp(-(x(1)^2 + x(2)^2)./3);
plot(x,z,'c-');

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回答（2 个）

Chad Greene
Chad Greene 2016-5-31
Something's there, but it's a straight line of zeros because exp(-(x(1)^2 + x(2)^2)./3) equals zero and cyan is difficult to see.
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Luke Radcliff
Luke Radcliff 2016-6-1
编辑：Luke Radcliff 2016-6-1
well not always say if i do like
x= [1 1] or x = [3 5]
I get values but they are negative. I guess I should just set the domain so i can see the negatives, how do i do that
Luke Radcliff
Luke Radcliff 2016-6-1
编辑：Walter Roberson 2016-6-1
the equation also isn't giving me a vector of answers just 1.

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Walter Roberson
Walter Roberson 2016-6-1
You define your x as the row concatenation of two linspace() . You extract two values from that linspace and you plot. And the portion you plot is numerically zeros.
[x1,x2] = ndgrid(linspace(-10,10,1000), linspace(-10,10,1000));
z = -x1.*x2.*exp(-(x1.^2 + x2.^2)./3);
surf(x1, x2, z, 'edgecolor', 'none');
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Walter Roberson
Walter Roberson 2016-6-1
You have two independent variables, x and y, and one depending variable, z. You need 3 dimensions to plot the shape it makes. You could, though, instead produce a 2D image that is color coded:
imagesc(z)
Luke Radcliff
Luke Radcliff 2016-6-1
3 variables, yea why did I think i could... been a long day, don't even have to graph it I read the question wrong. Thanks for your help though.

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