Imagesc for triangular element
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KSSV on 4 Feb 2019
YOu can straight away plot contour with your data. Have a look in the following file exchange function: https://in.mathworks.com/matlabcentral/fileexchange/38858-contour-plot-for-scattered-data
If you want to use imagesc you have to convert your unstructured data into structured data either by using scatteredinterpolant or griddata.