Explain me the code how to calculate the value of u(x,t)=a exp(ct+bx).Plz explain in detail and how to plot the two dimensional graph of u(x,t)by keeping x constant and u(x,t) by keeping t constant

some has previously reply to it but by running the program its showing an error.Plz explain in detail the code

[John D'Errico]

You asked this same question many times over. Please stop asking the same question. If the answer was not sufficient for you, then ask for more information on those questions. At a quick count, it appears that you have now asked this question roughly 4 or 5 times. STOP ASKING!