Trouble reading reals from unknown length character string in Fortran - fortran

Question

This is a small portion of the data I am trying to read:
01/06/2009,Tom Sanders,,264,220,73,260
01/08/2009,Adam Apple,158,,260,,208
01/13/2009,Lori Freeman,230,288,218,282,234
01/15/2009,Diane Greenberg,170,,250,321,197
01/20/2009,Adam Apple,257,,263,256,190
01/21/2009,Diane Greenberg,201,,160,195,142
01/27/2009,Tom Sanders,267,,143,140,206
01/29/2009,Tina Workman,153,,124,155,140
02/03/2009,Tina Workman,233,,115,,163
02/03/2009,Adam Apple,266,130,310,,310
the numbers between each comma are from a different location
Where two commas would represent missing data and a trailing comma would mean the fifth data point is missing
My goal is to organize the data into a table after calculating the average of each site and person, hence my two dim arrays
I want my output to look something like the following:
(obviously neater formatting but a table nonetheless)
Average Observed TDS (mg/l)
Name Site 1 Site 2 Site 3 Site 4 Site 5
------------------------------------------------------
Tom Sanders 251.0 172.5 251.7 160.0 229.0
Adam Apple 227.0 130.0 277.7 256.0 236.0
Lori Freeman 194.0 288.0 216.7 279.0 202.7
Diane Greenberg 185.5 190.0 205.0 258.0 169.5
Tina Workman 193.0 140.0 119.5 155.0 163.0
This is my program so far:
program name_finder
implicit none
integer, parameter :: wp = selected_real_kind(15)
real(wp) :: m, tds
real(wp), dimension(20,5) :: avg_site, site_sum
integer, dimension(20) :: nobs
integer, dimension(5) :: x
integer :: ierror, i, nemp, cp, non, ni, n
character(len=40), dimension(20) :: names
character(len=200) :: line, aname
character(len=20) :: output, filename
character(len=3), parameter :: a = "(A)"
do
write(*,*) "Enter file to open."
read(*,*) filename
open(unit=10,file = filename, status = "old", iostat = ierror)
if (ierror==0) exit
end do
write(*,*) "File, ",trim(filename)," has been opened."
non = 0
outer: do
read(10,a, iostat = ierror) line
if (ierror/=0) exit
cp = index(line(12:),",") + 11
aname = line(12:cp-1)
n=0
middle: do
read(line,'(Tcp,f4.2)') tds
write(*,*) "tds=", tds
n=n+1
if (n>10) exit
i = 1
inner: do
if (i > non) then
non = non +1
names(non) = trim(aname)
!ni = non
exit
end if
if (aname == names(i)) then
!ni = i
!cycle outer
exit inner
end if
i = i + 1
end do inner
end do middle
end do outer
write(*,*)
write(*,*) "Names:"
do i = 1,non
write(*,*) i, names(i)
end do
close(10)
close(20)
STOP
end program name_finder
TLDR; I am having trouble reading the data from the file shown at the top of each site after the names.
Suggestions? Thanks!

Answer 1

I hope the following is helpful. I have omitted any easily assumed declarations or any further data manipulation or writing to another file. The code is used just to read the data line by line.
character(150) :: word
read(fileunit, '(A)') word ! read the entire line
comma_ind = index(word,',') ! find the position of first comma
! Find the position of next comma
data_begin = index(word(comma_ind+1:),',')
! Save the name
thename = word(comma_ind+1:comma_ind+data_begin-1)
! Define next starting point
data_begin = comma_ind+data_begin
! Read the rest of the data
outer: do
if (word(data_begin+1:data_begin+1) == ',') then
! decide what to do when missing an entry
data_begin = data_begin + 1
cycle outer
else if (word(data_begin+1:data_begin+1) == ' ') then
! Missing last entry
exit outer
else
! Use it to find the length of current entry
st_ind = index(word(data_begin+1:),',')
if (st_ind == 0) then
! You reached the last entry, read it and exit
read(word(data_begin+1:), *) realData
exit outer
else
! Read current entry
read(word(data_begin+1: data_begin+st_ind-1),*) realData
end if
! Update starting point
data_begin = data_begin + st_ind
end if
end do outer
There could be a more elegant way to do it but I cannot think of any at the moment.