C# 3D XYZ surface plot of a 2D array, and a possible issue

[Delano762]

Hey,
I'm trying to make a surface plot of a 2D array, where its indexes would be the x and y axes and the values of the array would be z = f ( x, y ), but I'm failing miserably, even with the documentation, and examples on PLplot site written in C++.

How hard would it be to create a plot like this and what do I need?

I was trying to tinker around with plot3d method and I've checked out your C# example - I can set up the XYZ environment, but I can't create the plot itself:

Exiting my program causes this error to show up in my VS:
*** PLPLOT ERROR, ABORTING OPERATION *** plot3dcl: Bad option, aborting operation

Here's "my" code so far:

`var pl = new PLStream();

         //use SVG backend and write to SineWaves.svg in current directory

            pl.sdev("pngcairo");
            pl.sfnam("SineWaves.png");

        // use white background with black foreground
        pl.spal0("cmap0_alternate.pal");

        // Initialize plplot
        pl.init();

        double[] xIndexes, yIndexes;
        xIndexes = new double[temp.width];
        yIndexes = new double[temp.height];
        for (int i = 0; i < temp.width; i++)
            xIndexes[i] = i;
        for (int i = 0; i < temp.height; i++)
            yIndexes[i] = i;
        //Mesh opt = new Mesh();
        double[,] CDF = new double[surface.width, surface.height];
        for (int i = 0; i < surface.width; i++)
            for (int j = 0; j < surface.height; j++)
                CDF[i, j] = CumulativeDistributionFunction[i, j].result;//This is the array I'm trying to make a plot of

        Mesh opt = new Mesh(); // line with possible issue

        pl.adv(0);
        pl.col0(1);
        pl.vpor(0.0, 1.0, 0.0, 0.9);
        pl.wind(-1.0, 1.0, -1.0, 1.0);

        pl.w3d(1.0, 1.0, 1.0, 0, surface.width, 0, surface.height, 0, 1,60, 30);
        pl.box3("bnstu", "x axis", 0.0, 0, "bnstu", "y axis", 0.0, 0, "bcdmnstuv", "z axis", 0.0, 4);

        pl.col0(2);

        pl.scmap1n(256);

        pl.plot3d(xIndexes, yIndexes, CDF, opt, true); //line with possible issue
        pl.col0(3);
        pl.mtex("t", 1.0, 0.5, 0.5, "Title");
        // end page (writes output to disk)
        pl.eop();

        // output version
        pl.gver(out var verText);
        Console.WriteLine("PLplot version " + verText);`

Now about the possible issue - in the C and C++ implementations of example 11 that I've looked at (http://plplot.org/examples.php?demo=11&lbind=C%2B%2B), the plot3d method takes the opt argument as an int:
static const int opt[]; ... pls->plot3d( x, y, z, XPTS, YPTS, **opt[k]** | MAG_COLOR, true );

While in C# plot3d takes opt argument as a Mesh:
public void plot3d(double[] x, double[] y, double[,] z, Mesh opt, bool side);

As a result I have no idea what am I supposed to pass there, not to mention that I can't find the definitions of DRAW_LINEX, DRAW_LINEY and DRAW_LINEXY, or what they are anyway. Is opt supposed to be a Mesh?

So in the end - what am I doing wrong, what do I need to do to make a 3D plot of a 2D array, and could you maybe translate the example 11 to C#?