Hi Joe:

Thank you so much for your help.

You came with an elegant solution, I appreciate it very much.

Moshe.

Hi Joe:

Thank you so much for your help.

You came with an elegant solution, I appreciate it very much.

Moshe.

Robert: Thanks for your answwr.

I'm trying to calculate only 4 distinct points (at 6, 10, 15 & 20C) using the `if` statements.

Unfortunately the `if` statemenrts by themselves work but once in the ODE I cannot get a solution.

If piecewise does it, I'll appreciate it if you would show me how.

Thanks.

Robert: Thanks for your answwr.

I'm trying to calculate only 4 distinct points (at 6, 10, 15 & 20C) using the `if` statements.

Unfortunately the `if` statemenrts by themselves work but once in the ODE I cannot get a solution.

If piecewise does it, I'll appreciate it if you would show me how.

Thanks.