How can i visualize an exact column or row only of a matrix?

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Elias Unk
Elias Unk 2017-7-22
评论： Elias Unk 2017-7-23
let's say i have a 50 by 70 matrix and i want all the values of the column number 29, how can i do that.

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Image Analyst
Image Analyst 2017-7-22
Extract from .mat file, then call plot. Try this:
storedStructure = load('features.mat');
myMatrix = storedStructure.B; % Extract matrix from the "B" field of the structure.
plot(myMatrix(:,29), 'b-', 'LineWidth', 2);

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Walter Roberson
Walter Roberson 2017-7-22
plot( YourMatrix(:,29) )
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Image Analyst
Image Analyst 2017-7-23
Just to expand on this for something you might want to know about some day, if you use
storedStructure = load('features.mat')
it reads in all the variables you stored as fields of storedStructure. So if you have stored A, B, and C, you'd have storedStructure.A, storedStructure.B, and storedStructure.C. Now if you wanted to pull out just one of those (which probably won't make any speed difference unless they were huge), you could ask load() to load just one from the file. For example:
storedStructure = load('features.mat', 'B');
Now storedStructure will have only a B field, not an A and C field. You could also extract the variable into its own B variable, if you want, like this:
B = storedStructure.B;
Just an FYI.

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