Whiteout/Remove some part of the contour plot

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Muhammad Usman 2019-11-6

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编辑： Muhammad Usman 2020-4-13

采纳的回答： Robert U

I use the built-in MATLAB function "scatterInterpolant" to plot a contour. The plot is shown below.

It's s stress contour and the ellipse is an empty space and there are no nodes inside the ellipse. I want the ellipse to be whiteout. Somehow I managed to set the values inside the ellipse to be zero (because I can't delete them) and I got the following result

I want the ellipse to be whiteout. Any sort of help is highly appreciated. Thanks in advance.

P.S. I use the fill command to fill the ellipse with white color but that's not a proper way to do it.

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Robert U 2019-11-7

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Hi Muhammad Usman,

instead of assigning Zero to the nodes you don't want to use, apply "nan"-Values. That will be treated as if there is no value assigned and will be plotted with white color.

x = -100:100;
y = -100:100;
inputData = rand(201);
inputData(abs(x)<=10,abs(y)<=10) = nan;
contourf(x,y,inputData,'LineStyle','none');

Kind regards,

Robert

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darova 2019-11-7

I like that solution. It works

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Muhammad Usman 2019-11-7

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Thank you very much sir for your kind response, but there is another problem I am encountering. As you can see in the figure below that it also whiteout some of the nodes outside the ellipse.

What do you think about that?

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Tamas Lanci 2020-4-3

Is there any chance you can share your code Muhammad?

Muhammad Usman 2020-4-13

编辑：Muhammad Usman 2020-4-13

在 MATLAB Online 中打开

F = scatteredInterpolant(xgrid, ygrid, plotcomp, 'nearest') ;
% plotcomp contains the values of stress etc at xgrid and ygrid i.e. mesh
[X,Y] = meshgrid(); % creat equally spaced rectangular mesh
Z = F(X,Y);
% then access the nodes of [X,Y] mesh grid which are inside the hole\ellipse
Z( " nodes inside the hole " ) = nan ;