How to use .mat file for dimensionality reduction

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RUPESH 2013-2-2

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https://ww2.mathworks.cn/matlabcentral/answers/61661-how-to-use-mat-file-for-dimensionality-reduction

Hi, I want to dimensionaly reduce the data set in Excel file. I converted data set in Excel file to .mat file. Now i want to use this for dimensionlity reduction. How can i use this file... i tried to find intrinsic dimensionality then it showed following error: >> whos Name Size Bytes Class Attributes

num       200x5              8000  double              
raw       200x5             68000  cell                
txt         0x0                 0  cell

>> d= intrinsic_dim('C:\Users\lenovo\Desktop\xl.mat', 'MLE'); ??? Index exceeds matrix dimensions.

Error in ==> intrinsic_dim at 218 knnmatrix= .5 * log(distance(2:k2 + 1,:));

Can u tel me what m i missing... Thanks in advance.

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Answer 1

Shashank Prasanna 2013-2-2

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https://ww2.mathworks.cn/matlabcentral/answers/61661-how-to-use-mat-file-for-dimensionality-reduction#answer_73560

在 MATLAB Online 中打开

I think you need to pass the matrix and not the file it self to the function:

Try the following with you matrix data:

d= intrinsic_dim(num, 'MLE');

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RUPESH 2013-2-6

Thank you sir..

RUPESH 2013-2-6

Thank you sir for the solution. Sir now i want to know, how to retrieve the original data after the dimensionality reduction has been done?, that is the opposite of this dimensionality reduction. So that we check whether the retrieved data is same.Is there other toolbox or the same toolbox can be used. Thank you.

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