[batuning]

i have a code ,can you run it . with your compiler ,it was f77 i convent it to f90
seems have small mistake , i put .the original website for code : f77
and also put zip code for f90
f90 code:
JOUKOWSKY.zip

website of f77 code :
http://www.laboratoridenvol.com/info...kowsky.en.html

[naffrancois]

Hello,

I think you misunderstood the meaning of my answer in your previous thread . When I compile your new fortran file I have the following output:

Warning: Deleted feature: End expression in DO loop at (1) must be integer

To make it short, what this means is that real indexing is no longer supported by the current fortran standard.

When you have DO i=a,b,c . a, b and c should be integer variables and not real variables as it is in your code. As such your new version is not fortan 90. I suggested you a way of modifying these loops in your previous thread.

Nevertheless, your code compiles without warnings by forcing the compiler to deal with f77 instructions:

gfortran -std=legacy JOUKOWSKY.f95 and the resulting coordinates file looks correct

[batuning]

thanks .but where i shoud put "gfortran -std=legacy JOUKOWSKY.f95"

which part of code,,you know im new in FORTRAN ..pls ..show me where ..
if you talk with example and show .in real code i can understand better your mean
thank u

[naffrancois]

gfortran is a fortran compiler. So the command gfortran -std=legacy JOUKOWSKY.f95 compiles your file JOUKOWSKY.f95 into an executable. The option -std=legacy is an option which tells the compiler to take into account old fortran code.

If you are using linux, you execute this command into the terminal:
gfortran -std=legacy JOUKOWSKY.f95 -o prog

This will give you an executable called prog. You then execute the program with the command ./prog.

[batuning]

Originally Posted by naffrancois

gfortran is a fortran compiler. So the command gfortran -std=legacy JOUKOWSKY.f95 compiles your file JOUKOWSKY.f95 into an executable. The option -std=legacy is an option which tells the compiler to take into account old fortran code.

If you are using linux, you execute this command into the terminal:
gfortran -std=legacy JOUKOWSKY.f95 -o prog

This will give you an executable called prog. You then execute the program with the command ./prog.

i use windows 7

[batuning]

whats wrong with my code , seems all need i done but still has error
look at it :
NACA AIRFOIL DESIGN.zip
also :
base of 5-digit airfoil equations is also same with 4 digit airfoil and all is in this link :
http://www.aerospaceweb.org/question...ls/q0041.shtml

[naffrancois]

There are many mistakes in your code, the basic structure itself would be for example like this:

PROGRAM example
IMPLICIT NONE
INTEGER, PARAMETER :: imax=10
REAL :: a,b,c ! scalars
REAL :: d(imax) ! array

CALL example_routine(imax,a,b,c,d)

END PROGRAM example

SUBROUTINE example_routine(imax,a,b,c,d)
INTEGER :: imax
REAL :: a,b,c
REAL :: d(imax)

END SUBROUTINE example_routine

yt is an array but you declare it as a scalar. Look at the example above and also at the file JOUKOWSKY you attached in a prevous message. I can help you with specific questions regarding coding. But you should first make the effort of reading and learning the basics, there are many resources online to start with:

http://pages.mtu.edu/~shene/COURSES/...F90-Basics.pdf
http://nci.org.au/user-support/train...amming-basics/

[batuning]

i do that you said ,
i have final code ,but i don't understand what is " np"
..if no need i can change it
also why i dont see any result ..i need x and y code(numbers )
like this "
X------------ Y
0.000000 -4.582653
-
0.000500 - 3.151760 -
.
.
.
"

here the code:

NACA AIRFOIL DESIGN.zip

[naffrancois]

Hello, have a look to the example structure I put in my previous message. In the main program, you have to CALL the subroutine otherwise nothing happens. Something like this:

program airfoil
IMPLICIT NONE

INTEGER,PARAMETER :: np=10
REAL, DIMENSION(np):: xtop, ytop, xbot, ybot
REAL, DIMENSION(np) :: x

CALL MakeFoil(xbot,ybot,xtop,ytop,np,x)

end program airfoil

Please carefully check what you are doing in the code makes sense. At the end of the routine you print to the screen x. What is x ? Is it declared ? Is it given a value somewhere ?

[naffrancois]

What is np ? What you want in the end are the coordinates x and y of your airfoil top and bottom. You airfoil obeys an equation of the form y(x). The exit variables are xtop( : ), ytop( : ), xbot( : ) and ybot( : ). The size of these arrays is np. So np is the number of points on the x axis, e.g. the resolution, the accuracy you get on the geometric description.

[batuning]

thanks .
i repair the code ..seems no error ,..
the result numbers aren't true numbers i think ...i guess it should show numbers in 2 columns ..or 2 arrays or something like that ...
like this :
number----------number
number----------number
number----------number

.
.
.



whatever,the important thing is make true numbers and create that.

that " print x " on my previous code was for test to show result ....was nothing serious i deleted it and put new one


is the result numbers true? can you run in plotter?:
result.zip


here the final code :
Attachment 59134