How to plot number of a matrix with colorcode?

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AS
AS 2021-12-16
评论： AS 2021-12-16
A matrix with dimension 2193 * 2, where 1st column is depth and 2nd column is number ( 1 to 6). I want to plot these number with specific color like 1 is green, 2 is black, 3 is cyan, 4 is red, 5 is blue, and 6 is yellow. How to plot it with specific color against depth. Please, help me with useful information. thanks
  2 个评论
DGM
DGM 2021-12-16
编辑：DGM 2021-12-16
Ran in:
What exactly do you want? When you say "plot it with specific color against depth", you realize that the result for each category will be constant-valued, right?
A = xlsread('Book1.xlsx');
scatter(A(:,1),A(:,2),10,A(:,2))
cmap = [0 1 0; 0 0 0; 0 1 1; 1 0 0; 0 0 1; 1 1 0];
colormap(cmap)
I'm assuming you want something other than this. Maybe something like this?
figure;
A = xlsread('Book1.xlsx');
idx = 1:size(A,1);
uv = unique(A(:,2));
hold on
for k = 1:numel(uv)
mask = A(:,2) == uv(k);
plot(idx(mask),A(mask,1),'o');
end
cmap = [0 1 0; 0 0 0; 0 1 1; 1 0 0; 0 0 1; 1 1 0];
set(gca,'colororder',cmap)
Not that I think that's particularly readable either.
AS
AS 2021-12-16
thank you for your answer. But I want to plot these number with depth value (1st column). Depth will be in Y-axis. And the numbers will be plotted as color.

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采纳的回答

DGM
DGM 2021-12-16
编辑：DGM 2021-12-16
Ran in:
You can use pcolor()
A = xlsread('Book1.xlsx');
w = 100;
h = pcolor(1:w,A(:,1),repmat(A(:,2),[1 w]));
set(h,'edgecolor','none')
set(gca,'ydir','reverse','xticklabel',{})
axis equal
xlim([1 w])
cmap = [0 1 0; 0 0 0; 0 1 1; 1 0 0; 0 0 1; 1 1 0];
colormap(cmap)
Something like that?

更多回答（3 个）

Walter Roberson
Walter Roberson 2021-12-16
编辑：Walter Roberson 2021-12-16
Ran in:
filename = 'https://www.mathworks.com/matlabcentral/answers/uploaded_files/835655/Book1.xlsx';
A = readmatrix(filename);
N = size(A,1);
pointsize = 25;
cmap = [0 1 0; 0 0 0; 0 1 1; 1 0 0; 0 0 1; 1 1 0];
scatter(1:N, A(:,1), pointsize, A(:,2));
colormap(cmap);
colorbar()
ylabel('Depth')
xlabel('row number')
scatter(A(:,2), A(:,1), pointsize, A(:,2))
colormap(cmap)
xlabel('category')
ylabel('Depth')
boxplot(A(:,1), A(:,2))
xlabel('category')
ylabel('depth')
DGM
DGM 2021-12-16
编辑：DGM 2021-12-16
Ran in:
Here's my latest guess:
A = xlsread('Book1.xlsx');
uv = unique(A(:,2));
hold on
for k = 1:numel(uv)
mask = A(:,2) == uv(k);
plot(A(mask,1));
end
cmap = [0 1 0; 0 0 0; 0 1 1; 1 0 0; 0 0 1; 1 1 0];
set(gca,'colororder',cmap)
ylabel('depth')
xlabel('sample number')
Here, depth is plotted against the number of each sample in the respective categories. If depth is plotted against the sample number across all categories (i.e. the row subscript), then the result is the same as Walter's first example and the second example I gave.
AS
AS 2021-12-16
Thanks everyone for your responses. But, I want to plot it using imagesc coomand. I have plotted it and unable to mention specific colorcode of mine. Like ike 1 is green, 2 is black, 3 is cyan, 4 is red, 5 is blue, and 6 is yellow. Kindly, help me to sove this.

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