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| Exactly what I was looking for. Many thanks. |
| thanks that saved my day. But you didn't mention how it generate the polynomials from that expressions. |
| basically, what you have is something like f[x]:={g1[x],g2[x],g3[x],g4[x]} or, to put it in words, you have a vector (f) whose components are dependent on a parameter (x) in various ways (the different g's) now, if I understand... |
| Use `Sow` and `Reap` [CollectingExpressionsDuringEvaluation.html][1] [1]: https://reference.wolfram.com/language/tutorial/CollectingExpressionsDuringEvaluation.html |
| I'm not sure what the problem was. It works for me in 10.3. In[1]:= $Version Out[1]= "10.3.0 for Microsoft Windows (64-bit) (October 9, 2015)" In[2]:= f[x_] := {{x*5, x^2}, {x, x - 1}} In[3]:= f[x] ... |
| If the two delta functions have one common variable, you can use the identity: delta(x1-x) delta(x-x2) = delta(x1-x2) |