Re: plotting mulitple variables vs y

[Kirk]

Ben thanks for the hint, I am more wanting to plot say y vs x1(for all value) for the first value of x2 then increase the value of x2 by the number 0.5 and plot y vs x1 for all vlaues of x1 and so on. So that in the end I end up with say 3 lines from 0 to 1.5 in the x direction and there y values in the vertical. SO this might come close but the mesh I believe is more of a 3d plot. Thanks
Kirk

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From: Ben Abbott <address@hidden>
To: Kirk <address@hidden>
Cc: "address@hidden" <address@hidden>
Sent: Tuesday, April 23, 2013 11:25 AM
Subject: Re: plotting mulitple variables vs y

On Apr 23, 2013, at 12:01 PM, Kirk wrote:

> I am trying to plot 2 variables in an equation against the y value but it does not seem to be doing that for me in Octave.
> my small example I came up with is this code below
>
> z=0.1;
> for x1 = 1:0.5:2
> for x2 = 0:0.1:1.5
>
> y = sqrt(x1+x2^2)+z;
> hold on;
> plot(y,x2);
> end
> hold off;
> end
>
>
> I don't know if there is an easier way or if my syntax is wrong but i get a plot but with no value points or a line connecting them.
> Kirk

Does this do what you want?

z = 0.1;
x1 = 1:0.5:2;
x2 = 0:0.1:1.5;
[x1, x2] = meshgrid (x1, x2);
y = sqrt (x1 + x2.^2) + z;
mesh (x1, x2, y)

Ben