![]() Please note that I want to draw in gnuplot. Sp './ratio.dat' u 1:2:3 w l title 'contour' Here is a sample script which doesn't work as desired: set size square I can draw the grid lines and contour lines separately but I am unable to draw the contour lines as well as grid points together. John L.I want to draw a plot like attached here. 4.6 angles animation ANOVA arrow axes background basics bessel binary border boxes cairolatex call circle cntrparam colormap configuration contour csv cube dashed data datafile depthorder dgrid3d do documentation epslatex errorbars eval fill filledcurves fit for format functions gif grid head hidden3d histogram HSV if image implicit index install interactive interpolate invert isosamples italic iteration jpg key label labels legend linecolor lines linespoints linestyle linetype list load logscale lua macros margin Matlab matrix maxcolors multiplot non-continuous object palette parametric pm3d png points polygon postscript ratio rect rectangle relative reread rgb rgbimage samples separator size sort special-filenames sphere splot sprintf standalone standard input stats steps string style svg symbols system table terminal tics tif tikz transparent Ubuntu variable vectors wave field word wxt xticlabel zoom In addition to the equipotential lines the value of the contour is stored as a third column in the equipotential_lines.txt file and can be plotted on the graph, too. ![]() The set table command stores the contour lines to a file, and finally the last command plots the stored lines. The positions of the lines are given by the cntrparam levels which are chosen in a way, to get equally spaced lines in the far field. Plot 'equipotential_lines.txt' u 1:2 w l ls 1 Set cntrparam levels discrete 4,5,6.67,10 # distance between contour lines according to 1/r In order to get these lines we need the function of the potential v(x,y) and make a contour plot with splot to a file to save the positions of the lines. 1 equipotential lines for the electric field of six charges equally spaced on a plate are shown. 1 Equipotential lines of a plate with electric charges ( code to produce this figure) The code shown so far is put into external functions ( electron.gnu, positron.gnu) and can be used in any script to plot equipotential lines, as the one used to generate Fig. These functions generate a color gradient starting from the blue, which is used as the line color for the equipotential lines, into a slight white.īlue(x,n) = sprintf("#XXX",r(x,n),g(x,n),b(x,n)) The color is chosen according to the blue function for the electron, which is a little tricky and composed of the three color functions r,g,b. This is termed grid data, and is required for drawing a surface, for contouring ( set contour ) and hidden-line removal ( set hidden3d ). The size and position are determined by the posx,poxy,size functions. Set for object n object_number \įc rgb blue(n,max/1.0) fillstyle solid noborder lw 0 ![]() Set for object n object_number circle \Īt posx(x,n,max/1.0),posy(y,n,max/1.0) size size(n,max/1.0) This effect can be achieved with Gnuplot by plotting a bunch of circles with slightly different color and size on top of each other. The line width of the contour lines A sample data set is as shown below I have problem with Matplotlib contour graph Contour plot with python The report lives online at a shareable URL and can be embedded into other pages, like this chart showing how the size of Lego sets have changed since 1950: The report lives online at a shareable URL and. ![]() There the electron is drawn as a red sphere with some lightning effect and the positron as a red sphere. In addition the sources should be plotted as well, as can be seen in Fig. 1 Equipotential lines of an electron and a positron ( code to produce this figure, electron.gnu, positron.gnu)
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