Hi, I solved a differential equation using Mathematica using NDsolve, I get some solution, but I only know how to plot it in Mathematica. The problem is that I need the data - numbers - and I want to work with then a finally make the graph using gnuplot. Is there any way how can I cat data in text format? Export["*.txt", f[t] /. sol, "Table"] but the output was in useless format - I need two columns from which a could make my own chart . . . Thaks a lot and sorry for my english.