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Dinamic format specifier
- Thread starter Feddozz
- Start date
Is it possible to read them in unformatted? For instance,
N=10
read(40,*) (A(I),I=1,N)
...
blah blah blah, more code...now
N=12
read(40,*) (A(I),I=1,N)
etc..
the first time you read file 40, you'll read a row of 10 numbers. the second time, you'll read 12 numbers in one row.
N=10
read(40,*) (A(I),I=1,N)
...
blah blah blah, more code...now
N=12
read(40,*) (A(I),I=1,N)
etc..
the first time you read file 40, you'll read a row of 10 numbers. the second time, you'll read 12 numbers in one row.
- Thread starter
- #4
Hi,
Thanks for the replies.
@prost
As I told you in the other post your suggestion is correct, with it I understood that my problem is different.
After reading I need to write these values and in that case I really need a format specifier, because if I use an unformatted write, after a certain number of written values (about 5 values) the PC decides to continue in another row. Instead I need to write the whole array in a row even if it is long 15 values.
@johnhors
Can you please explain me the meaning of the following line,
I've never seen it.
Tnx
Thanks for the replies.
@prost
As I told you in the other post your suggestion is correct, with it I understood that my problem is different.
After reading I need to write these values and in that case I really need a format specifier, because if I use an unformatted write, after a certain number of written values (about 5 values) the PC decides to continue in another row. Instead I need to write the whole array in a row even if it is long 15 values.
@johnhors
Can you please explain me the meaning of the following line,
Code:
write(string(2:4),'(I3)')NTnx
- Thread starter
- #5
If it is possible to convert the content of an integer variable to a string the dynamic format could work as follows:
I tried to use the casting statement
but I realised that it converts the integer in the correspondent ASCII char
Does someone knows if this type of conversion is possible in FORTRAN?
Code:
PROGRAM DYNFOR
CHARACTER A*4
N=12
A= !A STATEMENT THAT CONVERTS THE CONTENT OF N IN '12'
1 FORMAT(A(F10.3))
ENDI tried to use the casting statement
Code:
CHAR()Does someone knows if this type of conversion is possible in FORTRAN?
Feddozz
Firstly, instead of using a format statement, the code I showed you above used a character string to describe the desired format. The advantage of this is that the character string can be modified at run time to suit your requirements, whilst under standard fortran rules a format statement cannot be modified (although some NON-standard extensions to the standard with some compilers have allowed this happen in the past).
So if N equals 5 then :-
string='( F10.2)'
write(string(2:4),'(I3)')N
would make string = '( 5F10.2)' ,then
read(*,string)(a(i),i=1,N)
is equivalent to:-
read(*,10)(a(i),i=1,N)
10 FORMAT(5F10.2)
All of which answers your original posting.
Firstly, instead of using a format statement, the code I showed you above used a character string to describe the desired format. The advantage of this is that the character string can be modified at run time to suit your requirements, whilst under standard fortran rules a format statement cannot be modified (although some NON-standard extensions to the standard with some compilers have allowed this happen in the past).
So if N equals 5 then :-
string='( F10.2)'
write(string(2:4),'(I3)')N
would make string = '( 5F10.2)' ,then
read(*,string)(a(i),i=1,N)
is equivalent to:-
read(*,10)(a(i),i=1,N)
10 FORMAT(5F10.2)
All of which answers your original posting.
- Thread starter
- #7
- Status