By Walter S. Brainerd

ISBN-10: 0070002487

ISBN-13: 9780070002487

A primary functional consultant to Fortran ninety by way of contributors of the X3J3 Committee. this can be a educational on Fortran ninety for programmers and engineers and scientists who paintings with Fortran seventy seven and want to profit the seriously revised criteria supplied for in Fortran ninety. lined during this consultant to programming languages are simple ideas, basic programming workouts, a variety of examples and difficulties. Written by means of 4 senior individuals of the ANSI Fortran criteria Committee X3J3, this ebook serves as a short resource of data for practicing execs.

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Extra resources for A Programmer's Guide to Fortran 90

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The intrinsic procedure will be applied to each element in the array separately, but again arrays must be conformable. The following are examples of elemental intrinsic procedures: 1. Find the square roots of all elements of an array, a. ) b=SQRT(a) 2. Find the string length excluding trailing blanks for all elements of a character array ch. 4 WHERE Statement The WHERE statement can be used to perform assignment only if a logical condition is true and this is useful to perform an array operation on only certain elements of an array.

If there is not, the program execution aborts. The intrinsic function SIZE is often used when declaring automatic arrays. SIZE has the form: SIZE(ARRAY [,DIM]) This returns the extent of ARRAY along dimension DIM, or returns the size of ARRAY if DIM is absent. 52 Fortran 90 Student Notes Array Processing Note that an automatic array must not appear in a SAVE or NAMELIST statement, nor be initialised in a type declaration. The following example shows the automatic arrays, work1 and work2 which take their size from the dummy arguments n and a: SUBROUTINE sub(n,a) IMPLICIT NONE INTEGER :: n REAL, DIMENSION(n,n), INTENT(INOUT) :: a REAL, DIMENSION(n,n) :: work1 REAL, DIMENSION(SIZE(a,1)) :: work2 ...

4. Find the average value greater than 3000 in an array. In Fortran 77 this requires DO loops and IF statements, whereas Fortran 90 code is: av=SUM(a,MASK=(a>3000))/COUNT(MASK=(a>3000)) 44 Fortran 90 Student Notes Array Processing Note in the last two examples the use of the following array intrinsic functions: MAXVAL - returns the maximum array element value. SUM - returns the sum of the array elements. COUNT - returns the number of true array elements. 3 Elemental Intrinsic Procedures Fortran 90 also allows whole array elemental intrinsic procedures.

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A Programmer's Guide to Fortran 90 by Walter S. Brainerd


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