how to read every section of a file using tcl? -



how to read every section of a file using tcl? -

i have started learning tcl , have problem reading big file. have info file looks following:

420 360 360 360 3434.01913 p 6.9022 0.781399 -0.86106 c 4.36397 -0.627479 3.83363 p 6.90481 5.42772 3.08491 ....

and ends this:

p -7.21325 1.71285 -0.127325 c -4.14243 0.41123 4.67585 420 360 360 360 3210.69667

so c lastly line of 1 section , 420 start of next section.so every 420 lines create section of whole file. how can read every section of file , have "frame1" , until end of file (having frame2, frame3 , ...). have come simple script read whole file line line not know how this.thanks

the reply question "how read every section of file using tcl?" quite "keep reading until run out of lines".

the reply question "how count sections , skip header lines" this:

while { ...condition... } { if {[gets $fp line] < 0} break lassign $line name x y z if {$name eq "420"} { incr section_counter } elseif {$name in {p c}} { # info } }

the status while loop tested 1 time each line read. first if command breaks out of loop 1 time entire file has been read. don't need split line read unless expect 1 of lines contain string isn't proper list. 1 time have assigned fields of line variables, can within name see kind of line got. sec if command says if $name string "420", section counter increased. if, on other hand, $name contains "p" or "c", have info line process. if neither of these conditions fulfilled, have line after "420" line, ignored.

documentation: break, gets, if, incr, lassign, while

tcl

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