Unrecognized function or variable 't'.

Answer 1

[Star Strider]

Just befor the ‘u’ assignment, insert these assignments:

tmax = 10; % Maximum Time

tnum = 150; % Number Of Elements in ‘t’

t = linspace(0, tmax, tnum);

The rest of the code should then work (although I cannot test it because it is difficult to read the image).

.