![]() ![]() The unset object is executed after the first plot in the multiplot environment, because the loudspeakers should only be drawn once. The three waves before the desired loudspeakers are plotted within an iteration that effects the radius by using the for command. Plot for fx( t, n * 0.25, 0), fy( t, n * 0.25, 0) w l ls 1 unset multiplot Plot for fx( t, n * 0.25, pi / 8), fy( t, n * 0.25, pi / 8) w l ls 2 unset object # - Plot loudspeaker activity set parametricįx( t, r, phi) = -1.5 * cos( phi) r * cos( t)įy( t, r, phi) = -1.5 * sin( phi) r * sin( t) The set_loudspeaker.gnu function itself does the same as we have done in the draw a single loudspeaker entry, but in addition it uses a rotation matrix to change the orientation of the single loudspeakers.Īfter having set the loudspeakers, we add some activity to three of the loudspeakers and finally get the result in Fig. The eval(CMD) calls the set_loudspeaker.gnu function once for every single data line, which corresponds to a single loudspeaker. To create the variable, the add_loudspeaker function creates a string with the data for every single line of the data file. The plot command now enables us to add the data from the file to the variable CMD, which is then executed by the eval command. # - Read loudspeaker placement from data file set table '/dev/null' add_loudspeaker( x, y, phi) = sprintf(\ ![]() For the dummy plot we setting the output of the plot command to table and use /dev/null as the place to write the data. This can be done by a dummy plot, because by applying the plot command, variables can be stored. Now we have to read the data with Gnuplot and set the objects according to the data. Let us assume we have a data file containing the x position, y position and orientation phi of a single loudspeakers per line. When create the Gnuplot instance, you can pass some parameter to it, you can also set them when you call set () or plot (), they are the same. If one (or more) axis is timeseries, the appropriate coordinate should be given as a quoted time string according to the timefmt format string. Furthermore we allow the placement of the loudspeakers after entries in a data file. set logscale x set arrow 100,5 rto 10,2 plots an arrow from position 100,5 to position 1000,7 since the x axis is logarithmic while the y axis is linear. This time we will have a look at the case of setting more than one loudspeaker to your plot. In one of the last entries we have seen how to plot a loudspeaker with Gnuplot. 1 A circular loudspeaker array drawn with the object command ( code to produce this figure, set_loudspeaker function) ![]()
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