How to manipulate matrices to get the same dimensions?

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desert_scientist90 2019-11-25

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回答： Pravin Jagtap 2019-11-27

Hi I am trying to perform a regression analysis between two matrices. The first one has the dimensions of 145*35*40 when reshaped to 2d it gives matrix 5365*40. The other one is a 141*71*38 when reshaped to 2d it gives a matrix of 10011*38. How can I delete rows and columns to match the dimensions? Apologies in advance if this is a silly question. Thanks

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desert_scientist90 2019-11-25

X and Y are latitude and longitude Z is the years, do you think it will be a good approach to try logical indexing?

Star Strider 2019-11-25

Logical indexing is not relevant at present., at least with respect to the information you have presented The problem is that your matrices do not appear to be compatible with respect to their dimensions and with respect to doing any regressions with them.

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Answer 1

Pravin Jagtap 2019-11-27

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Hello,

From your question data representation i.e. ‘X’ (n by m) and ‘Y’ (n by 1) is not very clear for fitting ‘Y=Xβ’ (where m = # of features and n is # of datapoints).

It very easy to manipulate the matrices when the features and data representation is clear to perform the regression using MATLAB. Please refer to following documentations for getting clarity on the issue:

https://www.mathworks.com/help/matlab/data_analysis/linear-regression.html

https://www.mathworks.com/help/stats/regression-and-anova.html?s_tid=CRUX_lftnav

Kind Regards

~Pravin