A bit of background~ I'm using a wii mote to collect accelerometer data, and have the data exported to an excel document. This data is then imported into matlab using : a = xlsread(fileName); %reads in file name x = a(:, xColNum); %time y1 = a(:, y1ColNum); %accel value x y2 = a(:, y2ColNum); %accel value y y3 = a(:, y3ColNum); %accel value z what i'd like to do next is then set a threshold check so that if any of the values within each of the sets is greater than a decided value a trigger can be set. I'm not sure how to run the initial check on the y1, y2 ,y3 values. My first thoughts are to run a for loop on the sets and then have if statements that execute when the given values are reached. My only problem is i'm not quite sure how to code this within the m file. Also should it be part of a seperate function of just below the above code.