how to change matrix dimensions?

hi all

how can i change the matrix dimension from 312*1 to 276*1

thank you

[Mahdi]

What do you want to do with the values that you're cutting out from the first matrix? Do you want to remove the first 36 values? the last 36 values?

[lina]

i have two time period, from 1973-2006 (matrix dim= 408*1) the second one is from 1984-2009 (matrix dim=312*1) so, the period must calculate it is in between (1984-2006) matrix dim=276*1 this is i want to change with.

[Mahdi]

Do you know which index that the year 2006 corresponds to in the second matrix? (Where does the data stop for 2006?) Similarly, does your matrix tell you which year corresponds to which data point?

[lina]

no it doesnt

Answer 1

[Mahdi]

Based on what you told me, let's say that the data for the years 1984-2009 is stored in matrix A, you would simply do:

B=A(1:276,1);

Where B is the matrix containing the data from 1984 to 2006 if the year 2006 ends at the 276th row.

[lina]

it work with one but it didnt with other

[Mahdi]

What do you mean by the other? For the first matrix, the one from 1973 to 2006, you can do the following (again, assuming the data is in matrix A):

B=A(132:408,1);

[lina]

THANK YOU very much

[Image Analyst]

By the way, you're not changing the dimension of your matrix. What's you're doing is extracting a portion of A into a new matrix B. Nothing got changed.

Answer 2

[Image Analyst]

Try interp2() or (much, much easier) try imresize() if you have the Image Processing Toolbox.