I am trying to convert vector into an image using the code below
clear variables
load(Exe4_2022.mat')
n = length(b);
figure,
imagesc(reshape(b,sqrt(n),sqrt(n))),
colormap(gray),
axis off;
But I am getting this error. Could anybody tells me how to resolve this issue??
Error using reshape
Size arguments must be real integers.
I have attached the "Exe4_2022.mat" file with this post.
Thanks
Dear Zuffain Hussan ,
A couple of your friends in the business school have a concept for a great new picture editing application for mobile devices, but they need help on the technical side of things. They’ve asked you to come on board and help write some of the code necessary to manipulate the images. It just so happens that you have been studying matrix manipulations in your differential equations class, and this knowledge along with some basic programming skills will allow you to make a significant contribution to the application.
https://www.colorado.edu/amath/sites/default/files/attached-files/imagemanipulationedit.pdf
Regards,
Shafagat
Zuffain Hussan I don't know if this is the code you want. Please take a look at the code and the plot attached.
Alternatively, you can check the code here https://replit.com/@ijobayer/VectorToImage#code.m
Thank you.
The numbers of lines and columns of the matrix representing the image you want to obtain must be integers and their product must equal the length of the vector you want to convert. In your example the length of the vector is n=55929. You want to obtain a squared matrix with square(n) lines and columns, but in your example m=square(n)=2.364931288642442e+02, which is not an integer. If we chose a number of 3 columns and a number of 18643 lines we will obtain the following Matlab code which works.
clear variables
load('Exe42022.mat');
n = length(b);
m=sqrt(n);
c=reshape(b,18643,3);
figure,
imagesc(c),
colormap(gray),
axis off;
Please try this code.
You could also try reshaping b so it isn't square, because there are not the right number of elements in b for it to be square. Find a square or rectangle that has a number of elements close to length(b) and then add zeros to b to make it this long.
If you are expecting it to be square, and it isn't, then you are unlikely to be able to make any sense of the image. How long should each row or each column be?
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