splot | Scala Plotting Library | Data Manipulation library

Ok, I tested with gnuplot 5.2.6, and there you don't see this behaviour. Pretty, strange. I'm not sure why this has changed. With gnuplot 5.4 you can work around for example with the following. Check help keyentry.

Code:

There are auxilliary keywords that can modify binary filetype=png w rgbimage. The ones you want are dx and dy (see "help binary keywords"). In your case the image is 2000x2000 pixels and each pixel represents an area 57599/2000 = 28.8, so the plot command becomes

I think the problem is that sActor contains tags so createTextNode(sActor) will encode the <'s. Unless you have some other reason to use MSXML2 objects I would suggest removing the tags from the data and building the xml more simply, for example

What you have to do is obvious: besides your 3 vectors you have to plot 9 additional lines. However, this not too obvious how to do this with gnuplot. Check the following example:

Code:

Technically, you should have received an error on LoadXML (unless it returns an empty doc) since your template XML string is not well-formed for various reasons:

• No proper root. You close but never open it with at beginning.

• All nodes do not close. Try adding self-closing tags where you can append text nodes later.

• Per XML specs rules, node names cannot start with a number and cannot start with xml keyword.

  [Definition: A Name is an Nmtoken with a restricted set of initial characters.] Disallowed initial characters for Names include digits, diacritics, the full stop and the hyphen.

  Names beginning with the string "xml", or with any string which would match (('X'|'x') ('M'|'m') ('L'|'l')), are reserved for standardization in this or future versions of this specification.

Consider following adjustment using underscore starts for forbidden node names:

Well, the code you use looks more like C and not C++. (which is fine too)

In C, you can use fprinf instead of printf .. have a look here:

In your f(x,y), xy should read x*y. Check the following. Play with the sampling, i.e. set samples and set isosamples to get higher or lower resolution. Furthermore, check help pm3d and help set palette.

Code:

It's not completely clear to me what your exact expectations are..., but I would use the plotting style with boxxyerror (check help boxxyerror).

Code:

It would help if you attached an example of your image data to the question, and also if you provided a link to a plot similar to the one you are trying to create. There are many different styles one might use to represent a surface. I will attempt to guess at a possible solution.

Input image (scribbled in GIMP and saved as a png image):

Gnuplot surface plot: