triangle-wave code snippets in matlab

plot symmetrical triangle wave from (0,0.25) amplitude of 1. from (0.25,0.375) amplitude of 0 from (0.375,0.625) amplitude of -1. from (0.625,1) amplitude of 0 in matlab

plot triangle wave peak at 1 for 0.25 second then zero for 0.125 then -1 for 0.25 second then zero for (3*0.125) in matlab