Interview Questions.

Question 1. What Is Gnuplot?

Answer :

Gnuplot is an interactive plotting application this is command based totally.
It is used for plotting functions and records points in 2D and 3-D plots.
Gnuplot supports many formats of facts factors and features.
It is mainly used for showing medical statistics .
It helps 3D data points and surfaces in diverse patterns like contour plot, mesh etc.
Question 2. Which Plat From Supports Gnuplot?

Answer :

Gnuplot helps various OS platforms along with Windows, Linux, Unix, OSX.
Current version helps even on older operating structures consisting of MS-DOS,KAmiga, OS-9/68k, Atari ST. 
The legacy structure platforms help versions below four.0
Gnuplot is a freeware authored by way of freelance authors, volunteers.
The compilation of Gnuplot script is exceptional for man or woman operating structures.
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Question three. Explain About Gnuplot Functionality?

Answer :

Following is the capability of gnuplot.

Two-dimensional capabilities and records factors plotting.
Three-dimensional data factors and surfaces plotting in contour and mesh styles.
Computing algebraic expressions in integer, waft and complicated arithmetic.
User defined warm keys.
Extensive on-line assist.
Gnuplot helps TEX-like textual content formatting for facts points, axes, titles and labels.
Command line editing in person friendly manner.
Question four. How To Change Symbol Size, Line Thickness And The Like In Gnuplot?

Answer :

Various commands are available to assign line and factor homes.
These properties encompass coloration, thickness, form of point etc.
The command take a look at shows a test page for the chosen terminal kind.
The check web page indicates all to be had pre-defined combinations of colours, length and shapes.
The command ‘set fashion’ is used to define the combinations.
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Question five. How To Animate In Gnuplot?

Answer :

Animated graphs are a hard and fast of plots.
These graphs are available in suitable formats.
Version gd 2.Zero.29 or later supports direct era of an lively GIF.
Scripts may be written to generate output of GIF documents.
The generated lively GIF documents may be carried out in animators inclusive of ‘gifsicle’. 
The ‘mpeg_encode’ command encodes the sequences of photos into mpeg layout films.
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Question 6. How To Generate Plots In Gif Format?

Answer :

GIF layout aid is supplied through external library of Gnuplot.
One such library is ‘libgd’.
Versions 1.2 to at least one.Four of libgd produces simplest GIF output.
Versions 1.6 to two.0.27 supports PNG outputs.
Version 2.Zero.28 of Boutell gd library restored the guide of GIF capability.
To get the support of GIF, gnuplot need to be related with any compatible gd library.
Question 7. How To Include Gnuplot Graphs In Word Processor?

Answer :

Usually, store a plot to a word processor format that gnuplot understands.
Read the plot from the word processor. 
Vector formats like PostScript, pdf, TEX,LATEX and so on. Are desired.
Vector codecs helps scaling the graph later to the proper size.
Use ‘set time period’ to get available record layout listing.
It is usually recommended to check and accurate the bounding container of the graphs in ‘eps’ file format.
Use GSView viewer for previewing the photo container.
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Question 8. How To Print Out Graphics In Gnuplot?

Answer :

To print graph, ‘set terminal’ is used. 
For example, ‘set terminal postscript’ produces the graph in PostScript layout.
The out positioned can be redirected through the use of ‘set output’ command.
The following script allows to produce output of a graph sin(x) in PostScript format:

gnuplot> plot [-6:6] sin(x)
gnuplot> set terminal postscript
gnuplot> set output "sin.Playstation "
gnuplot> replot

Question 9. Is Gnuplot Suitable For Scripting?

Answer :

Yes. Gnuplot is suitable for scripting.
The scripts can be examine via gnuplot during an interactive consultation.
It additionally runs in batch mode.
Running in batch mode is accomplished via piping a pre-current record.
A move of instructions can also be despatched to stdin, to run in batch mode.
Packages together with Octave is effortlessly wrapped in a cgi script for use as an internet-driven plot generator.
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Question 10. Why The Origin Of Z-axis Is Not On The Xy-plane?

Answer :

The zero-factor of Z-axis is located above the XY plane of splot.
‘set ticslevel’ is used to transport this foundation onto the XY aircraft.
By setting ticslevel=zero, the 0 of Z-axis moves onto the XY plane.
The following is the script to try this:
gnuplot> set ticslevel 0
gnuplot> splot (x**2)*(y**2)
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Question 11. How To Change Contours In Gnuplot?

Answer :

Contours are controlled through the command ‘set cntrparam’.
Following example illustrates alternate of contours:

gnuplot> set contour
gnuplot> set cntrparam stages 12
gnuplot> set cntrparam degrees incremental -1, zero.2, 1
gnuplot> set cntrparam levels discrete -0.2, -0.5, 0.2, zero.5

The key world ‘stages’ defines the ranges of drawn contour curves.
In the above instance, degrees 12 suggests that twelve contour traces are drawn.
Incremental defines the initial cost, increment fee and the very last cost.
A legend for contour traces is to be had within the legend graph.
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Question 12. How To Make Surface Mesh Finer?

Answer :

The mesh length, indicated with the aid of XY coordinates is determined through ‘isosample’.
The default variety is 10.
To get the finer mesh the dimensions should be extra.
The mesh length issues whilst a hidden line option is used with ‘set hidden3d’.
To keep away from those issues, make ‘isosample’ larger, like 30 and above.
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Question 13. How To Plot Implicit Defined Graphs?

Answer :

Implicit graphs are plotted indirectly.
The following instance illustrates the procedure:
gnuplot>
gnuplot> characteristic(x,y) = y - x**2 / tan(y)
gnuplot> set contour base
gnuplot> set cntrparam levels discrete 0.0
gnuplot> unset floor
gnuplot> set desk 'graphcurves.Dat'
gnuplot> splot feature(x,y)
gnuplot> unset table
gnuplot> plot 'graphcurves.Dat' w l

The feature() units the coordinates.
The contour graph is defined in ‘graphcurves.Dat’ record.
‘splot’ executes the characteristic.
‘plot’ places the graph inside the file ‘graphcurves.Dat’ record.
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Question 14. How To Fill An Area Between Two Curves?

Answer :

A pseudo document ‘+’ is used to fill the area among two curves. 
The option ‘filledcurves’ closed is used.
The following instance demonstrates the process. The  curves are f(x) and g(x).
F(x)=cos(x)
g(x)=sin(x)
xmax=pi/four
set xrange [0:xmax]
plot '+' the use of 1:(f($1)):(g($1)) with filledcurves closed
Question 15. How To Include Accented Characters?

Answer :

8 bit person codes are used to acquire accented characters.
Example of accented man or woman is ü
Following is an example to consist of accented characters:
gnuplot> set encoding iso_8859_1
gnuplot> set identify "M374nchner Bierverbrauch 374ber die Jahre"
gnuplot> plot "bier.Dat" u 1:2
Like sensible, characters in Czech, French, Russia characters can be sorts the use of set encoding.
Two or extra encoding characters cannot be jumbled together one document. Ex. Accents for west and east latin encodings.
UTF-8 encoding fonts can be a widespread solution.
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Question sixteen. How To Plot Two Functions In Non-overlapping Regions?

Answer :

Parametric plot can be used to plan 2 capabilities in non-overlapping areas.
Following examples illustrates:
gnuplot> set parametric
gnuplot> aaf=1
gnuplot> bb=3
gnuplot> cc=2
gnuplot> dd=4
gnuplot> x1(t) = aa+(bb-aa)*t
gnuplot> x2(t) = cc+(dd-cc)*t
gnuplot> f1(x) = sin(x)
gnuplot> f2(x) = x**2/eight
gnuplot> plot [t=0:1] x1(t),f1(x1(t)) title "f1", x2(t), f2(x2(t)) title "f2"
The closing line of code is parametric plot that plots the features x1 and f1, x2 and f2.
Question 17. How To Produce Graph Of An Exact Border Size?

Answer :

Position the top, left, backside, proper borders in fractional position inside the web page.
The following script set the exact border size.
Set lmargin at display screen zero.05
set bmargin at display 0.05
set rmargin at display 0.95
set tmargin at display screen zero.95
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Question 18. How To Fix The Bug Of Partial Displaying Of Output Files?

Answer :

Flush the output with a ultimate set output.
Certain output codecs like PostScript, PDF,Latex, and so forth., places many pages in a single resultant record.
The file stays open after each plot by means of gnuplot. So that additional plots may be brought to it. 
The record is available to the external programs as it is in open kingdom. 
As the documents are open and stay unclosed, the partial output is plotted.
To keep away from the issue, specify the time period for a plot using ‘set term’.
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Question 19. How To Call Gnuplot In A Pipe Or With A Gnuplot-script Doesn't Produce A Plot?

Answer :

Gnuplot may be known as by way of using a perl script.

Following script illustrates:

#!/usr/local/usr/local/bin/gnuplot -persist") or die "no gnuplot";
# force the buffer to flush after each write
use FileHandle;
GP->autoflush(1);
print GP,"set term x11;plot '/tmp/information.Dat' with linesn";
near GP

Question 20. How To Plot A Vertical Line?

Answer :

There are three alternatives to plan a vertical line using Gnuplot.

A vertical line can be plotted using ‘set arrow ….. Nohead’.
- The begin and quit factors of an arrow want to be explicitly computed.
Other opportunity is to generate the in lined information factors and plot them.
Another procedure is to apply parametric mode of gnuplot.
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Question 21. How Would You Define A Function In Gnuplot?

Answer :

In Gnuplot, you may outline your personal capabilities. Functions are described using C programming-style definitions, with the same operators and C math library, functions, apart from the **, operator, that is the exponentiation. For your reference, a listing of integrated features and operators are provided here.

Here is an instance of the definition of a sinc feature. (The sinc function is described because the sine of pi instances x divided by using pi times x, and is used normally in communications applications.)

sinc(x) = sin(pi * x) / (pi * x)

The cost pi is a predefined fee.