MATLAB 矩阵转化为灰度图

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A=[ 1.00    0.96    0.98    0.88    0.94    0.61    0.96    0.80    0.98    0.89 0.96    1.00    0.94    0.90    0.95    0.71    0.96    0.83    0.90    0.88 0.98    0.94    1.00    0.84    0.91    0.54    0.93    0.73    0.97    0.90 0.88    0.90    0.84    1.00    0.89    0.85    0.94    0.94    0.80    0.82 0.94    0.95    0.91    0.89    1.00    0.72    0.94    0.84    0.90    0.90 0.61    0.71    0.54    0.85    0.72    1.00    0.74    0.90    0.48    0.64 0.96    0.96    0.93    0.94    0.94    0.74    1.00    0.90    0.92    0.87 0.80    0.83    0.73    0.94    0.84    0.90    0.90    1.00    0.70    0.75 0.98    0.90    0.97    0.80    0.90    0.48    0.92    0.70    1.00    0.85 0.89    0.88    0.90    0.82    0.90    0.64    0.87    0.75    0.85    1.00]; mat = A;           %# A n-by-n matrix of random values from 0 to 1 imagesc(mat);            %# Create a colored plot of the matrix values colormap(flipud(gray));  %# Change the colormap to gray (so higher values are                          %#   black and lower values are white) textStrings = num2str(mat(:),'%0.2f');  %# Create strings from the matrix values textStrings = strtrim(cellstr(textStrings));  %# Remove any space padding [x,y] = meshgrid(1:10);   %# Create x and y coordinates for the strings，it should be set based on the number of labels. hStrings = text(x(:),y(:),textStrings(:),...      %# Plot the strings                 'HorizontalAlignment','center'); midValue = mean(get(gca,'CLim'));  %# Get the middle value of the color range set(gca,'XTick',1:10,...                         %# Change the axes tick marks         'XTickLabel',{'能源','材料','工业','可选消费','日常消费','医疗保健','金融','信息技术','电信服务','公共事业'},...  %#   and tick labels         'YTick',1:10,...         'YTickLabel',{'能源','材料','工业','可选消费','日常消费','医疗保健','金融','信息技术','电信服务','公共事业'},...         'TickLength',[0 0]); [x,y] = meshgrid(1:10);   %# Create x and y coordinates for the strings hStrings = text(x(:),y(:),textStrings(:),...      %# Plot the strings                 'HorizontalAlignment','center'); midValue = mean(get(gca,'CLim'));  %# Get the middle value of the color range textColors = repmat(mat(:) > midValue,1,3);  %# Choose white or black for the                                              %#   text color of the strings so                                              %#   they can be easily seen over                                              %#   the background color set(hStrings,{'Color'},num2cell(textColors,2));  %# Change the text colors