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I'm trying to plot a 3d graph of when a function, F(i,j,k) = 1 ...I want to plot 3 variables that correspond to the i j and k against each other when the function equals 1.

...I've tried using surf but it tells me that its Z component needs to be a matrix, not a scalar or vector.. but I don't know how else to do it.

Any help would be greatly appreciated!

Thanks!