1st graph plots fine, 2nd graph is an error.

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Matt Reiser
Matt Reiser 2015-2-4
回答： Star Strider 2015-2-4
x = linspace(-30,30,30001); y = ((sin(x)) ./ (x)); plot(x,y,'-'); axis([-30 30 -.25 1]) xlabel('x') ylabel('y') title('Reiser Graph of sin(x) / x') x = linspace(-20,20,20001); y = (2 ./ (sqrt(3+x.^2))); z = (-1 ./ (sqrt(2+x.^2))); >> plot(x,y,z,'-') Error using plot String argument is an unknown option.
I need both y and z plotted in 2D. Please Help

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回答（2 个）

Roger Stafford
Roger Stafford 2015-2-4
You cannot plot three variables in two dimensions! Either use plot3 or else plot only two of your variables. For example, plot y against x using one color and plot z against x using another color.
Star Strider
Star Strider 2015-2-4
See my Comment to my Answer to your previous Question: http://www.mathworks.com/matlabcentral/answers/175177-i-have-a-problem.

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