how to plot matrix

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Fatma Nur Disci
Fatma Nur Disci 2020-12-24
评论： Durganshu 2021-1-3
Hi all,
I have 2304x1024 matrix. I assume that each 3 rows of this matrix describe an image.(so I have 768 images and each image size = 3x1024 ). And want to plot it.
Can anyone help me with this please?

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回答（2 个）

Subhadeep Koley
Subhadeep Koley 2020-12-24
This code snippet extracts out the first image and plots it. Similarly you can extract the other images.
% Defining a random matrix for demo
matrix = rand(2304, 1024); % Use your matrix here
% Extract first 3 rows
image1 = matrix(1:3, :);
% Visualize
figure
imagesc(image1)
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Subhadeep Koley
Subhadeep Koley 2020-12-28
@Fatma Nur Disci the below code might work for you
% Defining a random matrix for demo
yourMatrix = rand(2304, 1024); % Use your matrix here
% Extract all images in a cell array
imagesArray = cell(768, 1);
ind = 1;
for idx = 1:3:2304
imagesArray{ind, 1} = yourMatrix(idx:idx+2, :);
ind = ind + 1;
end
% Visualize them all in one figure
figure
montage(imagesArray, 'BorderSize', 20)
colormap parula
Fatma Nur Disci
Fatma Nur Disci 2020-12-29
Thanks I tried it, just gives me one picture.
I need to see 768 images seperately in a single figure(or table, window. I don't know what it is called.).
From image1 to image 768.

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Durganshu
Durganshu 2020-12-24
编辑：Durganshu 2020-12-24
Let your 2304x1024 matrix be data. I'm assuming that you have to obtain these images successively in a single plot. If that is not the case, please specify how do you actually want to plot it.
for i=1:3:size(data,1)
for j=1:size(data, 2)
image(1,j) = data(i,j);
image(2,j) = data(i+1,j);
image(3,j) =data(i+2,j);
end
imagesc(image);
hold on;
end
Hope that helps!
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Fatma Nur Disci
Fatma Nur Disci 2020-12-28
编辑：Fatma Nur Disci 2020-12-28
Order is not important . Let's assume that imagesc(1:3, 1024 ) gives the first image, imagesc(4:6,1024) describes the second one and so on.
for ind=1:768
start= (ind-1)*3+1;
stop=ind*3;
data = wholedata(start:stop,:);
imagesc(data); %%%% or pcolor(data) or %%%% I = mat2gray(data) and imshow(I)
end
When I use plot instead of imagesc I can plot multiple graphs in one figure :
figure
for ind=1:768
start= (ind-1)*3+1;
stop=ind*3;
data = wholedata(start:stop,:);
subplot(1,768,ind);
plot(data);
hold on;
end
How to plot multiple images side by side in 1x768 format in a figure for example ? Or 32x24 format in a figure?
Thanks for your help.
Durganshu
Durganshu 2021-1-3
Hi Fatma,
Sorry for the late reply. I hope this can resolve your issue.
figure
position =1;
for ind=1:768
start= (ind-1)*3+1;
stop=ind*3;
data = wholedata(start:stop,:);
subplot(1,768,position);
imagesc(data);
hold on;
position = position+1;
end
Further, you can even use imshow and subplot for your functionality. I have never used it personally, so I'll just share the link where you can find more information on its impementation. Link!
Hope that helps!

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