Re: [Gnuplot-info] map view of data matrix with block structure

[Hans-Bernhard B. <br...@ph...>]

Michael Lasarev wrote:
> are all negative and closer to -1.  My problem is that on
> the boundary gnuplot is interpolating and plotting a 
> color that indicates it is near zero. 

Re-read "help set pm3d", in particular all the mentions of the 
"corners2color" option.

> What I want is a sharp distinction between the boundaries but nice 
> color gradients in each submatrix showing the transition towards +/-
> 1.

That wish is quite self-contradictive.

You may want to re-map the z value to conserve dynamic range neare +/-1,
while wasting as little space as possible on the intervening region. 
Something like

	splot 'file' u 1:2:(tanh(0.95*$3))

maybe.