How to separate specific data from a larger data set

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I have a data .mat file that is 9 x 2233. The ninth row "labels" the column with a value of one through six. I want to know what to do to create a new array of all the columns that have the same value in the ninth row.

Full story: I'm running a Simulink simulation that collects data every millisecond. During this simulation, the user has to complete a pointing task. When the user hits the first target, a second one appears elsewhere. In this particular data set there are six targets. The .mat file collects the Simulink time, xyz position of the user and the target, real time, and target number. Row 9 is the target number and I want to create a new array of the data that is specific to target 1.

Do you have a suggestion for creating a new array of all the columns where row nine=1 ?

Thank you in advance.