Plotting Functions : samples

gnuplot> plot sin(x)/x

gnuplot> plot [0:5] sin(x)

gnuplot> splot sin(x*y/20)

gnuplot> plot sin(x) title 'Sine Function', tan(x) title 'Tangent'

gnuplot> set title "Hello World"

gnuplot> replot

gnuplot> set polar

gnuplot> plot sin(t)

gnuplot> set xlabel "x"

gnuplot> set ylabel "y"

gnuplot> replot

gnuplot> set xrange [-pi:pi]

gnuplot> plot sin( x) w l ls 1, sin(2*x) w l ls 2, \

sin(3*x) w l ls 3, sin(4*x) w l ls 4, \

cos( x) w l ls 5, cos(2*x) w l ls 6, \

cos(3*x) w l ls 7, cos(4*x) w l ls 8

Define a function and plot

f(x)=sin(x)*cos(x)

gnuplot> a=0.25

gnuplot> b=0.02

gnuplot> c=0.05

gnuplot> d=0.1

gnuplot> f(x)=c/((x-a)*(x-a)+b)+d/sqrt(x)

gnuplot> set xrange [0:1]

gnuplot> set yrange [0:4]

gnuplot> plot f(x)

gnuplot> print f(0.4)

Plotting File

gnuplot>plot "file.int" w l

from a file having multiple column

gnuplot> plot "file1.int" using 1:2 title 'Column', "file1.int" using 1:3 title 'Beam'

What if we want to plot one_column against the another_colum, using the sm_other_column an error bar

gnuplot> plot 'file.int' using another_colum:one_column:sm_other_column with yerror

To plot the first two columns from multiple columns in a file

gnuplot> plot 'file1.int' using 1:2

from multiple files

gnuplot> plot "file1.int" using 1:2 title 'int file 1', \"file2.dat" using 1:3 title 'int file 2'

plot command customization

gnuplot> plot "file1.int" using 1:2 title 'Column' w l , "file1.int" using 1:3 title 'Beam' w lp

Create a title: > set title "My good name is Don "

Put a label on the x-axis: > set xlabel "Age(years)"

Put a label on the y-axis: > set ylabel "Achivements(fine in $)"

Change the x-axis range: > set xrange [1:30]

Change the y-axis range: > set yrange [500:5000]

Have Gnuplot determine ranges: > set autoscale

Move the key: > set key 0.01,100

Delete the key: > unset key

Put a label on the plot: > set label "Most successful time" at 18,1000

Remove all labels: > unset label

Plot using log-axes: > set logscale

Plot using log-axes on y-axis: > unset logscale; set logscale y

Change the tic-marks: > set xtics (1,5,10,15,20)

Return to the default tics: > unset xtics; set xtics auto

GNUPLOT SCRIPTS

set autoscale # scale axes automatically

unset log # remove any log-scaling

unset label # remove any previous labels

set xtic auto # set xtics automatically

set ytic auto # set ytics automatically

set title "Force Deflection Data for a Beam and a Column"

set xlabel "Deflection (meters)"

set ylabel "Force (kN)"

set key 0.01,100

set label "Yield Point" at 0.003,260

set arrow from 0.0028,250 to 0.003,280

set xr [0.0:0.022]

set yr [0:325]

CURVE-FITTING

f1(x) = a1*tanh(x/b1) # define the function to be fit

a1 = 300; b1 = 0.005; # initial guess for a1 and b1

fit f1(x) 'file.int' using 1:2 via a1, b1

to plot sin( column3 + column1 ) vs. 3 * column2 type:

gnuplot>plot 'file.int' using (3*$2):(sin($3+$1))

MULTI-PLOT: plot more than 1 graph in same window

set multiplot; # get into multiplot mode

set size 1,0.5;

set origin 0.0,0.5; plot sin(x);

set origin 0.0,0.0; plot cos(x)

unset multiplot # exit multiplot mode

adjust range

gnuplot> set xrange [0.01:20]

gnuplot> set yrange [0:2]

gnuplot> set logscale x

gnuplot> replot

Put Graduations

gnuplot> set ytrics 0

gnuplot> set mytics 10

gnuplot> set grid

gnuplot> replot

3d plots

gnuplot> set ticslevel 0

gnuplot> splot (x**2)*(y**2)

fine plot

gnuplot> set isosample 40

contour

gnuplot> set contour

gnuplot> set cntrparam levels 10

gnuplot> set cntrparam levels incremental -1, 0.2, 1

gnuplot> set cntrparam levels discrete -0.2, -0.5, 0.2, 0.5

gnuplot> set pm3d at b

gnuplot> set ticslevel 0.8

gnuplot> set isosample 40,40

gnuplot> splot x*x*exp(-x*x)*y*y*exp(-y*y)

colored

gnuplot> set xrange [-2:2]

gnuplot> set yrange [-2:2]

gnuplot> set pm3d

gnuplot> splot exp(-x*x)*exp(-y*y)

gnuplot> set term postscript eps enhanced color

gnuplot> set output "color.eps"

gnuplot> replot

gnuplot> set term postscript eps enhanced monochrome

gnuplot> set output "mono.eps"

gnuplot> replot

psudo 3d

gnuplot> set hidden3d

gnuplot> splot "file.int" w l

gnuplot> set pm3d

gnuplot> splot "test.dat" with pm3d

Polar Coordinate(plot with impulse: for nice view)

gnuplot> set polar

dummy variable is t for curves

gnuplot> set angles degrees

gnuplot> plot "file.int" with lines

gnuplot> set grid polar

plot (2 * t)

plot cos(2 * t)

plot cos(2 * t) w i ,2*t w l(change integer parameters)

plot cos(2*t)w i ,.5*t w i, t*t*.1 w i, t*t*t*.01 w i

Parameters

gnuplot> set parametric

dummy variable is t for curves, u/v for surfaces

gnuplot> const=3

gnuplot> set trange [1:4]

gnuplot> set xrange [0:5]

gnuplot> set yrange [0:5]

gnuplot> plot const,t

gnuplot> set parametric

dummy variable is t for curves, u/v for surfaces

gnuplot> set size square

gnuplot> set xrange [-1:1]

gnuplot> set yrange [-1:1]

gnuplot> plot [0:2*pi] sin(t),cos(t)

spiral

gnuplot> set xrange [-10*pi:10*pi]

gnuplot> set yrange [-10*pi:10*pi]

gnuplot> plot [0:10*pi] t*sin(t),t*cos(t)

Cardioid

gnuplot> set parametric

dummy variable is t for curves, u/v for surfaces

gnuplot> r(t) = 1+cos(t)

gnuplot> plot [0:2*pi] r(t)*cos(t),r(t)*sin(t)