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3579 - Transport in Cambridgeshire - seen by an outside observer. What can Wiltshire learn?
A week in Cambridge - traveling there, and around when I needed, without a car - and a chance to look, listen and learn a bit more about the wider transport issues of that city. Some may be lessons for us in Wiltshire, others may be items that I simply say "won't work here because of ...". Between ....

3578 - A busy start to 2012
It's been a busy start to the training and hotel year 2012 at Well House. I've already taught Learning to Program in Tcl, Tcl and Expect Programming, and two tailored private courses - Perl Programming and a more advance Perl course based on Perl for Larger Projects. Room occupancy at Well House M ....

3577 - How to do multidimensional arrays (or rather lists and hashes) in Perl
In Perl, you can have a list of lists, a hash of hashes, a hash of lists or a list of hashes - in effect, two dimensional arrays but with much more flexibility.And where you can have two dimensional arrays, you can go further and have 3, 4, or more dimensions - you are limited only by your ingenuity ....

3576 - Tcl - apparently odd behaviour of string trimleft
Question: Why does this code:   set dir "D:/JNN/proc/"   set tempname "D:/JNN/proc/Doc-99887767.dat"   set cname [string trimleft $tempname $dir]   puts $cname report   -99887767.dat but this code:   set dir "D:/JNN/proc/"   s ....

3575 - Multiple buttons calling the same proc in wish (tcl/tk)
Question: 1. I have created a table dynamically using a for loop in Tcl/Tk. 2. One of the columns in the table is a column of buttons 3. All the buttons call the same action proc as the each do something similar How can I set up the buttons so that I know which was pressed in the action proc? Ans ....

3574 - Perl functions such as chop change their input parameters
Typically, functions / named blocks of code take a series of operands / parameters as inputs, and return a result which is saved into another variable - here's an example in Perl:   $size = length($persname); Incoming value - read from $persname Action defined in - length Outgoing value ....

3573 - New in Java 7 - and why we are not running public Java 7 courses
Java 7 (or Java 1.7, if you prefer that name) was launched last summer, with new / improved features including: * switch on a String object * try with resources allowing easier cleanup / reducing memory leak potential * catch allowing multiple exceptions in the same block to avoid need to repair co ....

3572 - Adding Expect on top of Tcl - what is it and where can I get a training course to learn about it?
Expect adds extra commands on top of Tcl - allowing the Tcl programmer to control additional processes as is they were really being run from the command line. But because they're being run from within a program, a whole lot of commands can be run with little effort, responses analysed easily, with ....

3571 - Comparing loop commands in Tcl
Tcl offers you three different loop commands - here they are generating the same output: while A condition is tested, and if true the commands in a loop are performed. The condition is then retested (provided that you have passed the test into while as a deferred block)   set month 1 &n ....

3570 - Trapping errors in Tcl - the safety net that catch provides
What could possibly go wrong when you open a file in a program? Lots of things, actually. * You could try to open a file in directory you cannot access * You could try to read from a file that does not exist * You could try to read from something that's not a plain file - e.g. a directory * You c ....

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