From: Stefan Jahn <stefan@gr...>  20080401 16:00:10

Am Mo, 31.03.2008, 06:36, schrieb Darío Martín Escala: Hello! > Hi, my name is Dario and i am from Argentina. I am > using the software to simulate circuits in a advanced > mathematical course with applications on engineering > in my university. I have some problems i hope that you > can help me. > > i cant use the file based voltage source. > > I want to simulate a circuit whit a source like > (cos(2*pi*time)*sin(time))^2 (for example) in a > transitory simulation. i have used the equation tool > to make that function. then I save the values of the > equation as a .csv file. then i import the data (.csv) > and the program convert it to a .dat file. When i used > it in the voltage source and execute the simulator an > error message appear. The message says that the file > must have time like an independent variable and the > voltage source like a dependent. But when i open the > file, the time is listed like independent and the > voltage like dep. where is the problem? Can you please send both schematic and the data file? I'll have a look and fix it if possible... > Another problem is when i used the equation tool for a > sin function (for example y=sin(time)), it give to me > real and complex values, that when i want to make a > plot of the equation, both data groups appear on > graphic and give a bad one. i have seen it only on > sin(time), not with cos(time). (and i can fixed it > using real(sin(time)) but i dont know if it is normal > or its a bug. This is normal. Any vector in Qucs is complex valued. Kind regards, Stefan. 