remove not corresponding values in matrix

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M.Ven
M.Ven 2017-11-17
评论： M.Ven 2017-11-21
There are 2 matrices, matrix (1) of the dimensions 1374200x18 and matrix (2) larger one with 200000x2. Matrix (1) is a discontinue matrix with in column 1 the time vector. Matrix (2) is a continuous time vector and air pressure. Now i want obtain a vector with only with values of time corresponding to Matrix (1). Is this possible?
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M.Ven
M.Ven 2017-11-17
编辑：M.Ven 2017-11-17
My question is not really clear. I want to compare the first column of matrix (1) to column of matrix (2) and remove, for the not corresponding value, the entire row of matrix (2).

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KL
KL 2017-11-17
编辑：KL 2017-11-17
first create some dummy data,
mat1 = [1:10;rand(1,10)].'; % matrix with continuous values on column 1
mat2 = [randperm(20,10);rand(1,10)].'; %column 1 with discontinuities
now use ismemeber,
https://www.mathworks.com/help/matlab/ref/ismember.html
res = mat2(ismember(mat2(:,1),mat1(:,1)),:) %get the data of mat2 where its col1 matches with mat1's column 1.
if you want to remove the other values from mat2,
mat2(~ismember(mat2(:,1),mat1(:,1)),:) = [];

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