How do I visualize a matrix of values?

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Cliff Karlsson 2018-10-15

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https://ww2.mathworks.cn/matlabcentral/answers/424027-how-do-i-visualize-a-matrix-of-values

编辑： Cliff Karlsson 2018-10-15

I have a dataset with temperatures from an rotating cylinder. I have got some help to visualize it like a flat heatmap. Can someone show me some more examples of different ways to visualize the dataset?

    filename = ['data\\day\\' 'filenames.txt'];
  T = readtable(filename);
  tsize = size(T);
  tsize (1);
filename = strcat('data\\day\\', string(T{100,1}));
map100 = getHeatMap(filename);
filename = strcat('data\\day\\', string(T{1000,1}));
map1000 = getHeatMap(filename);
k=imshow([map100]);
colormap(gca, 'jet');
k=imshow([map1000]);
colormap(gca, 'jet');
function heat = getHeatMap(filename)
    s = dir(filename);
    fin=fopen(filename,'r');
    I=fread(fin,s.bytes,'uint8=>uint8'); 
    w = uint16(I(1))+256*uint16(I(2));
    h = uint16(I(3))+256*uint16(I(4));
    skip = s.bytes - w*h + 1;
    IN = I(skip:1:s.bytes);
      Z=single(reshape(IN,w,h));
      Z=griddedInterpolant(Z');
      y_range = linspace(1.0,single(h),360);
      x_range = linspace(1.0,single(w),512);
      heat = uint8(Z({y_range, x_range}));
      fclose(fin);
  end

This code produces an image like this:

But I have no clue of how to proceed to get other ways to show the image. The goal is to be able to make it easier to detect areas where the temperature is higher than "normal" data_file