Numerical Modelling in Fortran: day 2

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Miscellaneous things • Continuing lines: – f95 use ‘&’ at the end of the line – f77: put any character in column 6 on next line • Formats of constants: – Use ‘.’ to distinguish real from integer (avoid 2/3=0 !) – 1.234x10 -13 is written as 1.234e-13 • logical variables have 2 values: .true. or .false. • Variable naming rules: – start with letter – mix numbers, letters and _ – no spaces
Character/string definitions • character :: a (single character) • character(len=10) :: a (string of length 10) • character :: a*10, b*5 • character*15:: a,b (fortran77 style) • character(len=*) :: Name=‘Paul’ – automatic length, otherwise strings will be truncated or padded with spaces to fit declared length
Page 1 and 2: Numerical Modelling in Fortran: day
Page 6 and 7: Initialising variables • Always i
Page 8 and 9: Some intrinsic mathematical functio
Page 10 and 11: ead(*,*) and write(*,*) • read(*,
Page 12 and 13: functions and subroutines • Usefu
Page 14 and 15: same thing as subroutines (less ele
Page 16 and 17: Example internal function
Page 18 and 19: A r r a y s
Page 20 and 21: Homework • At the ‘Fortran 90 T
Page 22 and 23: Exercise 2: Mean and standard devia
Page 24 and 25: Finite Difference grid in 1-D • G
Page 29 and 30: Analysis • Subroutine arguments c
Page 31: Exercise 3: Second derivative • W

Numerical Modelling in Fortran: day 2

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