You installed gnuplot on Windows, opened Command Prompt or PowerShell, typed gnuplot — and got: ‘gnuplot’ is not recognized as an internal or external command, operable program or batch file. Gnuplot is almost certainly installed and working. Windows simply does not know where to look for it. What this message means When you type a…
Your data is fine and the curve is right, but the text is wrong: Température loses its accent, the degree sign in 25 °C turns into two strange characters, or a Greek letter in the axis label is replaced by a blank or a box. These are encoding and font problems, and they are fixable….
You set an output format and gnuplot refuses: gnuplot> set terminal pngcairo size 1000,700 unknown or ambiguous terminal type; type just ‘set terminal’ for a list (Your command will differ — the message underneath is the part that matters.) The terminal name you asked for is not one this particular gnuplot binary knows. What this…
You run gnuplot on a remote machine over SSH, or on a server with no desktop, and the interactive window never appears. Instead you get something like: gnuplot: unable to open display ” gnuplot: X11 aborted. Nothing is wrong with your script — gnuplot is trying to open an interactive window on a display that…
The file is right there in your folder — you can see it — yet gnuplot answers: warning: Cannot find or open file “data.dat” No data in plot This is one of the most common gnuplot frustrations, and it is almost never about the file itself. It is about where gnuplot is looking. What this…
Your script stops with a message like this: gnuplot> plot “data.dat” using 1:temperature with lines ^ undefined variable: temperature The caret points at a name gnuplot has never seen. Unlike a spreadsheet, gnuplot does not know the names of your data columns — and it also does not invent variables you forgot to define. What…
You run a plot command, gnuplot pauses, and instead of a graph you get this: warning: Skipping data file with no valid points gnuplot> plot “data.dat” using 1:2 with lines ^ x range is invalid The second message, x range is invalid, belongs to the same family: gnuplot accepted the command but ended up with…
