[kbaker]

Originally Posted by leflix

First how many points do you have in x direction (i) and in y direction (j) ?

I opened the file in excel and it clearly shows that its in i direction its 4624 (reaches end of file) and in y direction just 4 because I have 4 columns (j is loop for the variables which are x,y,u,v)

[leflix]

no what you read is the total number of nodes.
Imagine NI (number of nodes in I direction) is 20 and NJ ((number of nodes in J direction) is 45. Then you will have 900 total number of grid points.
this corresponds to your 4624

[kbaker]

My data consists of 4 columns each column has 4624 point please look to the the excel file I was uploaded it.

[leflix]

yes but it is not what I asked you. First you need to understand that in a 2D structured grid each node is referred to a couple of indice (i,j) ranging from 1 to NI and 1 to NJ respectively. Then you have a total number of nodes NI*NJ whhich correspond to the number of lines of you excell or .txt file.
Now if you want to use Tecplot you need to give him some information such as NI and NJ, the coordinnates of each point X(i,j), Y(i,j) and then the velocity componnents on each of these node U(i,j) and V(i,j). If you d'ont have these information you cannot use Tecplot.Having the total number of nodes (4624) is not sufficient.

[kbaker]

Originally Posted by leflix

yes but it is not what I asked you. First you need to understand that in a 2D structured grid each node is referred to a couple of indice (i,j) ranging from 1 to NI and 1 to NJ respectively. Then you have a total number of nodes NI*NJ whhich correspond to the number of lines of you excell or .txt file.
Now if you want to use Tecplot you need to give him some information such as NI and NJ, the coordinates of each point X(i,j), Y(i,j) and then the velocity components on each of these node U(i,j) and V(i,j). If you don't have these information you cannot use Tecplot.Having the total number of nodes (4624) is not sufficient.

Sorry for the misunderstanding. The number of nodes in x direction is 67 and in y direction is 67 . I am not too familiar with programing so I do not know how to start with the steps you mentioned and redefine the data into each node to let can be used in Tecplot?

[leflix]

I guess it is rather 68 and 68 as you have 4624 points

[kbaker]

As I understood from your reply I need now to convert the 4624 values of each variable in my txt file into (68*68) matrix ? Hence I need to save each variable in single file then I need four files in Tech plot? right? I will be grateful if you have an illustrated program ?

[kbaker]

I did it at last without need for fortran program using Tecplot but the problem legend not appear ? how I can show it?

[leflix]

no you don't need 4 files, only one.
Here is a program that reads tour stream.txt file and will generate the velocity.plt file to be used with tecplot.
I don't know if in your file stream.txt it should be read with
DO I
DO J

or
DO J
DO I

I don't have Tecplot on my computer presently so I cannot verify the result, but the file velocity.plt seems good excepted that the first point( x=0, y=0) is at the end of the file...

Try to understant what is done in this program

[leflix]

Kbaker you need to read the tecplot documentation or ask someone next to you who knows this kind of stuff. It is not something easy to explain tchating.