Hai I want to know how to plot contours. prasat

You can use Matlab, it is very easy... HOC

I have used matlab, VU, vigie, gnuplot and tecplot. Check out the cfd-online resources page.

Tecplot is better to make a contour plot or the flow field plot. Matlab is also ok, but difficult to make a grid point.

hai pravn,HOC,Ist I was asking about plotting contours when points are irregular. I do not think we can do it in gnuplot.But in matlab we can convert irreglar grids into regular grids. but I do not want to that. I want to plot in irreglar grids. Bye pratap

No ploblem to do it with tectplot. It should be also possible to call tecplot from your own program.

I think so.... maybe Tecplot is more flexible than matlab especially for irregular grid..

(1)"when points are irregular"-

do you mean nonuniform grid in rect cart coord?

(2)"in matlab we can convert irreglar grids into regular grids"-

if your answer to (1) is 'yes', then suggest revisit matlab. type 'help contour'. vectors x and y define x and y coord respectively. 'contour(x,y,z)' command does the job simply. the data format of matrix z should be consistent with x and y.

My tecplot is 9.0-2-3 but I could find a option for contours. Please write in detail and how to call it from my fortran program. prasat

Matlab can handle both structured and unstructured grids. For structured grid use "contour" and for unstructured triangular grids use "pdecont". If it is a totally arbitrary distribution of points, then there is an old software called "surfer" which can handle that. Even tecplot can do triangulation of a given distribution of points and then plot the contours.

I assume you data is on a triangular mesh. If so you are incorrect you can do it in both gnuplot and Matlab. I don't recall how to do it in gnuplot but the trimesh function in Matlab gets the job done