I'm trying to plot matrix data from an Excel file, but the plot I obtained (named "2") doesn't match my expected result (named "1"); here's my code—can anyone assist?

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Oluwasogo 2024-8-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2147649-i-m-trying-to-plot-matrix-data-from-an-excel-file-but-the-plot-i-obtained-named-2-doesn-t-match

评论： Oluwasogo 2024-8-28

I am trying to plot my matrix data from an excel file. However, what I obtained is the same as what I desired. The expected plot is name 1, while what I have obtained is named 2. Here is my code:

% Load the matrix from the Excel sheet
matrix1 = readmatrix('Sample_Axes.xlsx', 'Sheet', 'one');
% Create a figure with subplots
figure;
% Plot matrix1 using contour
subplot(1, 3, 1);
contourf(matrix1, 20, 'LineColor', 'none');  % 20 contour levels, 'LineColor', 'none' for no contour lines
cb1 = colorbar;
colormap jet;
title('Matrix 1');

Can someone help me out?

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Mathieu NOE 2024-8-27

在 MATLAB Online 中打开

pict.png

@dpb

this is the posted reference image

imshow('pict.png')

- we can clearly see the colorbar having a kind of log (signed) scale (can be interpreted as a "transformation" if you prefer) - to emphasize the rendering of low amplitude details around zero , which is the exact same topic addressed in the link I provided above (symmetric (diverging) logarithmic color map/scale)

Symmetric (Diverging) log color scale - MATLAB Answers - MATLAB Central (mathworks.com)

Oluwasogo 2024-8-28