Radial vector to circular plot

Question

Roel 2018-5-8

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/399784-radial-vector-to-circular-plot

评论： Pablo Venegas 2022-3-18

Hello all,

I have a 5001 x 1 vector which contains information about the intensity of a radially symmetric object. I would like to make an intensity plot of the circular object, preferably with imagesc, which would look like a circle with a radius of 5001.

The general shape would look somewhat like the contour plot below but I'm looking for a way to get the actual values to show, not a contour plot.

Thanks

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Jan 2018-5-8

Why do you want imagesc? WHat is the problem with the shown graphics? What are the "actual values" compared to shown image?

Roel 2018-5-8

编辑：Roel 2018-5-8

I want to use imagesc because I'm writing a report with comparisons to other cases where I've used imagesc. The shown contour plot shows contours whereas the actual values are more gradient. Below imagesc(I) where I is the vector.

I want to make a 'circular' version of this, to put it vaguely...

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Answer 1

Roel 2018-5-16

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/399784-radial-vector-to-circular-plot#answer_320419

在 MATLAB Online 中打开

My question has been answered somewhere else:

% Construct quarter slice
n       = length(I)
I       = [I;zeros(n,1)];          
[X, Y]  = meshgrid(1:n, flip(1:n));
r       = round(sqrt(X.^2 + Y.^2));           
A       = reshape(I(r(:)), n, n);    
% Plot whole beam slice without doubling
imagesc([fliplr(A) A(:,2:end) ; fliplr(flipud(A(2:end,:))) flipud(A(2:end,2:end))]); 
colorbar; xlim([0 2*num-1]);ylim([0 2*num-1]);