<< Chapter < Page Chapter >> Page >
Introduces graphical representation of data in LabVIEW MathScript.

Graphical representation of data in labview mathscript

LABVIEW MATHSCRIPT provides a great variety of functions and techniques for graphical display of data. The flexibility andease of use of LABVIEW MATHSCRIPT's plotting tools is one of its key strengths. In LABVIEW MATHSCRIPT graphs are shown in a figure window. Several figurewindows can be displayed simultaneously, but only one is active. All graphing commands are applied to the active figure. The command figure(n) will activate figure number n or create a new figure indexed by n .

Tools for plotting

In this section we present some of the most commonly used functions for plotting in LABVIEW MATHSCRIPT.

  • plot - The plot and stem functions can take a large number of arguments, see help plot and help stem. For example theline type and color can easily be changed. plot(y) plots the values in vector y versus their index. plot(x,y) plots the values in vector y versus x . The plot function produces a piecewise linear graph between its data values. With enough data points it lookscontinuous.
  • stem - Using stem(y) the data sequence y is plotted as stems from the x-axis terminated with circles for the data values. stem is the natural way of plotting sequences. stem(x,y) plots the data sequence y at the values specified in x .
  • xlabel('string') - Labels the x-axis with string .
  • ylabel('string') - Labels the y-axis with string .
  • title('string') - Gives the plot the title string .

To illustrate this consider the following example.

In this example we plot the function y = x2 for x 2 [-2; 2].

x = -2:0.2:2;

y = x.^2;

figure(1);

plot(x,y);

xlabel('x');

ylabel('y=x^2');

title('Simple plot');

figure(2);

stem(x,y);

xlabel('x');

ylabel('y=x^2');

title('Simple stem plot');

This code produces the following two figures.

Some more commands that can be helpful when working with plots:

  • hold on / off - Normally hold is off. This means that the plot command replaces the current plot with the new one. To add anew plot to an existing graph use hold on . If you want to overwrite the current plot again, use hold off .
  • legend('plot1','plot2',...,'plot N') - The legend command provides an easy way to identify individual plots when there are more than one per figure. A legendbox will be added with strings matched to the plots.
  • axis([xmin xmax ymin ymax]) - Use the axis command to set the axis as you wish. Use axis on/off to toggle the axis on and off respectively.
  • subplot(m,n,p) -Divides the figure window into m rows, n columns and selects the p p'th subplot as the current plot, e.g subplot(2,1,1) divides the figure in two and selects the upper part. subplot(2,1,2) selects the lower part.
  • grid on/off - This command adds or removes a rectangular grid to your plot.

This example illustrates hold , legend and axis .

x = -3:0.1:3; y1 = -x.^2; y2 = x.^2;

figure(1);

plot(x,y1);

hold on;

plot(x,y2,'--');

hold off;

xlabel('x');

ylabel('y_1=-x^2 and y_2=x^2');

legend('y_1=-x^2','y_2=x^2');

figure(2);

plot(x,y1);

hold on;

plot(x,y2,'--');

hold off;

xlabel('x');

ylabel('y_1=-x^2 and y_2=x^2');

legend('y_1=-x^2','y_2=x^2');

axis([-1 1 -10 10]);

The result is shown below.

In this example we illustrate subplot and grid.

x = -3:0.2:3; y1 = -x.^2; y2 = x.^2;

subplot(2,1,1);

plot(x,y1);

xlabel('x'); ylabel('y_1=-x^2');

grid on;

subplot(2,1,2);

plot(x,y2);

xlabel('x');

ylabel('y_2=x^2');

Now, the result is shown below.

Printing and exporting graphics

After you have created your figures you may want to print them or export them to graphic files. In the "File"menu use "Print" to print the figure or "Save As" to save your figure to one of the many available graphics formats. Using theseoptions should be sufficient in most cases, but there are also a large number of adjustments available by using "Export setup","Page Setup" and "Print Setup".

3d graphics

We end this module on graphics with a sneak peek into 3D plots. The new functions here are meshgrid and mesh . In the example below we see that meshgrid produces x and y vectors suitable for 3D plotting and that mesh(x,y,z) plots z as a function of both x and y .

Example: Creating our first 3D plot.

[x,y] = meshgrid(-3:.1:3);

z = x.^2+y.^2;

mesh(x,y,z);

xlabel('x');

ylabel('y');

zlabel('z=x^2+y^2');

This code gives us the following 3D plot.

Questions & Answers

How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
How can I make nanorobot?
Lily
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
how can I make nanorobot?
Lily
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get the best Algebra and trigonometry course in your pocket!





Source:  OpenStax, Introduction to labview mathscript. OpenStax CNX. Aug 06, 2006 Download for free at http://cnx.org/content/col10370/1.3
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Introduction to labview mathscript' conversation and receive update notifications?

Ask