how to use if else of for loops to manipulate matrices

i have a two column matrix (many rows) and i want to read column 1 values corresponding with certain values in column 2 under a certain condition that only column 2 can be tested. say column 2 must be over 3.4 and i want times corresponding(column1)

Answer 1

[Thorsten]

To get all values from column 1 of X, where column 2 is > 3.4:

x = X(X(:,2) > 3.4, 1);

[selassie ngara]

thanks, it makes sense but it takes a whyle to get your head arnd it

Answer 2

[Eng. Fredius Magige]

For can assist you in searching each index in sequence order through find function as long you know/specify appropriate condition to be determine by if else. Note that find function return to you raw and column, in many case column will 1 always.