![]() ![]() Syntax: plot 'file' every grid format with set dgrid3d. Rather than applying to blocks of single points, it applies to rows and column values. The every keyword has special meaning when used with matrix data. These triplets are then converted into gnuplot iso-curves and then gnuplot proceeds in the usual manner to do the rest of the plotting. Here is an example that uses both: $DATA. Similarly if the first field in each row contains a label rather than data, use the additional keyword rowheaders. įor text input, if the first row contains column labels rather than data, use the additional keyword columnheaders. In a uniform grid matrix the z-values are read in a row at a time, i. Splot 'file' binary general using 1:2:3 # binary input UniformĮxample commands for plotting uniform matrix data: splot 'file' matrix using 1:2:3 # text input This is the default for binary matrix input, but requires an additional keyword nonuniform for text input data. ![]() For binary input data, the first element of the first row must contain the number of columns. The first row of input data contains the y coordinates the first column of input data contains the x coordinates. ![]() ![]() The second interpretation assumes a non-uniform grid with explicit x and y coordinates. See matrix uniform for examples and additional keywords. This is the default for text data input, but not for binary input. The assigned y coordinates are the integers. The assigned x coordinates are the integers. The first of these assumes a uniform grid of x and y coordinates and assigns each value in the input matrix to one element M of this uniform grid. Gnuplot can interpret matrix data input in two different ways. It is no longer necessary to specify parametric mode for three-column splots. This is termed "grid data", and is required for drawing a surface, for contouring ( set contour) and hidden-line removal ( set hidden3d). If all blocks contain the same number of points, gnuplot will draw cross-isolines between points in the blocks, connecting corresponding points. No line will join points separated by a blank record. Single blank records separate blocks of data in a splot datafile splot treats blocks as the equivalent of function y-isolines. Additional values are generally used as errors, which can be used by fit. Three values are interpreted as an (x,y,z) triple. If two or four values are provided, gnuplot uses the last value for calculating the color in pm3d plots. If only a single value is provided, it will be used for z, the block number will be used for y, and the index of the data point in the block will be used for x. The plot option smooth is not available for splot, but cntrparam and dgrid3d provide limited smoothing capabilities.ĭata file organization is essentially the same as for plot, except that each point is an (x,y,z) triple. The options index and every behave the same way as with plot using does so also, except that the using list must provide three entries instead of two. In brief, binary and matrix indicate that the data are in a special form, index selects which data sets in a multi-data-set file are to be plotted, every specifies which datalines (subsets) within a single data set are to be plotted, and using determines how the columns within a single record are to be interpreted. The special filenames "" and "-" are permitted, as in plot. Splot, like plot, can display from a file. See also show plot, set view map, and sampling. The datafile options have more differences.Īs an alternative to surfaces drawn using parametric or function mode, the pseudo-file '++' can be used to generate samples on a grid in the xy plane. The operation of with is also the same as in plot except that not all 2D plotting styles are available. In non-parametric mode, ranges must be given in the order splot. The syntax for setting ranges on the splot command is the same as for plot. See set view and set xyplane for more information. The orientation of a splot projection is controlled by set view. The offset between the lowest ztic and the xy plane can be changed by set xyplane. The function can be a mathematical expression, or a triple of mathematical expressions in parametric mode.īy default splot draws the xy plane completely below the plotted data. Data file names are usually provided as a quoted string. The splot command operates on a data generated by a function, read from a data file, or stored previously in a named data block. See the plot command for many options available in both 2D and 3D plots. splot provides only a single x, y, and z axis there is no equivalent to the x2 and y2 secondary axes provided by plot. It is the 3D equivalent of the plot command. Splot is the command for drawing 3D plots (well, actually projections on a 2D surface, but you knew that). ![]()
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