How to plot this functions for linear programming

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Danijel 2013-1-22

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https://ww2.mathworks.cn/matlabcentral/answers/59509-how-to-plot-this-functions-for-linear-programming

I have this functions, and I want to plot them on same page because this is a problem in linear programing and I want to show both on same graph.

First is: f = x+0.0625*x^2 + y+0.0125*y^2 + z+0.025*z^2 (this is objective function)

Second is: g=x+y+z-952 (this is boundary)

Thanks!

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Walter Roberson 2013-1-22

Are you asking to plot a single point, f(112,560,280) ??

If you are wanting to plot f over a range of values of x, and a range of values for y, and a range of values for z, then you need x, y, and z graphic axes to represent the inputs, but you also need another graphics axis to represent the result f(x,y,z) -- a 4 dimensional plot. Is that what you were thinking of?

Danijel 2013-1-22

The second approach would be something what I was thinking of. I tried to plot the first function with isosurface, but I'm not sure wether this is truth what I'm getting as a result, because as I don't know which value for isovalue to set? Also, I don't know how to plot the g function on the same page...

[x,y,z] = meshgrid( linspace( -120, 600, 300 ) ); f = x+0.0625*x.^2 + y+0.0125*y.^2 + z+0.025*z.^2; isosurface(x, y, z, f, 476)

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