gnuplot

问题 How can I plot (a 3D plot) a matrix in Gnuplot having such data structure. I cannot find a way to use the first row and column as a x and y ticks (or to ignore them) ,5,6,7,8 1,-6.20,-6.35,-6.59,-6.02 2,-6.39,-6.52,-6.31,-6.00 3,-6.36,-6.48,-6.15,-5.90 4,-5.79,-5.91,-5.87,-5.46 Is the splot 'data.csv' matrix the correct parameter to use ? 回答1: You can give using a format specification; here we need to tell the seperator ','. The following works for me: splot 'data.csv' using 1:2:3 '%lf,%lf,

问题 I have a quite long gnuplot script. For debugging purposes, I would like to be able to block comment parts of this script or use a "goto" statement. Is this possible? I know I can use an if statement: if (1 == 2) { commented-out-code } else { non-commented-out code } Is this the only solution? 回答1: Comments in gnuplot start with a # . If you want to comment a whole block, your text editor should be able to do that (e.g. M-; in Emacs with the block selected). 回答2: Gnuplot doesn't support block

问题 I am new to gnuplot and while plotting stacked histogram, I find that legend gets hidden behind the data. Is there a method to put the legend above the data? Thanks a lot for your help. EDIT: I am currently using set key outside bottom to place legend outside, but that is not the best solution I would like. 回答1: Recent versions allow to make the background of the legend white: set key opaque This simply adds a white background to the legend so it appears on top of all graphs. Found the answer

问题 I am new to gnuplot and while plotting stacked histogram, I find that legend gets hidden behind the data. Is there a method to put the legend above the data? Thanks a lot for your help. EDIT: I am currently using set key outside bottom to place legend outside, but that is not the best solution I would like. 回答1: Recent versions allow to make the background of the legend white: set key opaque This simply adds a white background to the legend so it appears on top of all graphs. Found the answer

问题 The splot function from gnuplot that I use shows different scales of x, y and z axis. So, the final plot is often stretched along one axis. How could I specify that I want equal scale along all three axis? I read that 'set size square' does the job in 2D, but I wonder how could this be achieved with splot (3D). 回答1: Great question! I think you want set view equal xyz . (see help view equal ) 来源： https://stackoverflow.com/questions/10535222/splot-3d-plots-with-equal-scale-on-x-y-z

问题 From this question it turned out that in some cases it might be desirable to align a subplot relative to another's plot axes coordinates. If you check the gnuplot documentation, you will find that labels, arrows, objects (rectangles, polygons, circles, ...) can be positioned in different coordinate systems, i.e. axes, graph and screen (see help coordinates ). Subplots in a multiplot environment, however, (as far as I know) can only be aligned and sized relative to the screen, see help origin

问题 I have a dataset that defines two curves, and I want to fill the area between them. However, contrary to the standard situation, the abscissa is to be plotted on the vertical axis and the ordinates on the horizontal one; the abscissa indicates depth, this is a common plotting format in geophysics. In other words, I want something like plot 's.dat' u 1:2:3 w filledcurves but with swapped axes so that the filled area is bounded not at the top and bottom but to the left and right by the curves

问题 I have a dataset that defines two curves, and I want to fill the area between them. However, contrary to the standard situation, the abscissa is to be plotted on the vertical axis and the ordinates on the horizontal one; the abscissa indicates depth, this is a common plotting format in geophysics. In other words, I want something like plot 's.dat' u 1:2:3 w filledcurves but with swapped axes so that the filled area is bounded not at the top and bottom but to the left and right by the curves

问题 How can I convert the annoying 12h time format (with AM and PM) into the 24h time format? I wanted to avoid external programs like awk as in this example. Since gnuplot has a time-specifier %p for "am" and "pm" (check help time_specifiers ), I thought it would be easy. But the following code does not give the correct result, but a warning message: warning: Bad time format in string Maybe, I'm using %p incorrectly? Code: ### change 12h time format to 24h format (does not give correct results)

问题 It might be very simple, but I cannot find the specific answer to this: how can I plot the first vs the last and the second to last columns in several files whose column number is variable? is there something like plot "mydata.txt" using 1:-1? I've already tried to use tail, but I don´t know hot to specifically use it, and couldn´t make this answer Count columns in csv in gnuplot work neither :( Thanks! 回答1: An answer to Automatic series in gnuplot shows one possibility. But that doesn't work