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Oct23-11, 11:56 PM
P: 16
I am solving a PDE using NDSolve. It always give a message like:

"For the method`IDA, only machine real code is available. Unable to continue with complex values or beyond floating-point exceptions."

What does this mean? My code is as following.

NDSolve[{∂t S[z, t] == -I z S[z,t] -I A[z,t], ∂t A[z, t] == -I S[z,t] ,
S[z, 0] == 0, S[0, t] == -I t2 /2, A[z, 0] == 0, A[0, t] == t}, {S,A}, {t, 0, 1}, {z, 0, 1}, MaxSteps -> 10^6 ]

Any suggestions? Please Help!
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