Printing 1D array in Fortran as 2D array

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SUMMARY

The discussion focuses on printing a 1D array in Fortran as a 2D array using the WRITE statement. A specific example is provided with a REAL array defined as REAL,DIMENSION(2,3) :: array, and the correct syntax for printing each row is demonstrated using a DO loop. The use of the colon (:) as an implicit "all" operator for array operations is emphasized, clarifying its functionality in Fortran. Additionally, a common mistake regarding the placement of commas in the DO statement is noted.

PREREQUISITES
  • Understanding of Fortran syntax and array handling
  • Familiarity with REAL data types in Fortran
  • Knowledge of DO loops in Fortran programming
  • Basic concepts of array operations in programming
NEXT STEPS
  • Explore advanced array manipulation techniques in Fortran
  • Learn about the differences between Fortran and C array implementations
  • Investigate the use of implicit operators in Fortran
  • Study best practices for writing and structuring Fortran code
USEFUL FOR

This discussion is beneficial for Fortran programmers, educators teaching array operations, and developers transitioning from C to Fortran who need to understand array printing techniques.

BC2210
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They're not crazy, if I want to print all row entries in a column, then:
Code: 
REAL,DIMENSION(2,3) :: array

DO,i=1,2
  WRITE(6,*) array(i,:)
END DO

You can use the semi-colon as an implicit "all" when operating on arrays.
 
Yes. In C, two-dimensional arrays are simply one-dimensional arrayswhose element type is itself a one dimensional array. Since one-dimensional arrays are required to occupy contiguous storage, itfollows that the same must be true for an array of arrays.

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Last edited by a moderator:
minger said:
They're not crazy, if I want to print all row entries in a column, then:
Code: 
REAL,DIMENSION(2,3) :: array

DO,i=1,2
  WRITE(6,*) array(i,:)
END DO
I don't think you want that first comma after the DO.
minger said:
You can use the semi-colon as an implicit "all" when operating on arrays.
This character - : - is a colon. This one - ; - is a semicolon.
 
Right-o, as far as the comma, I occasionally get f90 and ANSYS APDL mixed up a bit. Also can't believe I called a, ':', a semi-colon. 1:11pm, perhaps, I was in a lunch daze.
 


BC2210 said:
Delete..
BC2210,
Although it's possible for you to delete your own post, it's not a good idea to do so. Other people can possibly learn from your question.
 
but why you want to delete the post was it not relevant
 
may be it was
 

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