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This is a function called Catenate. If one no longer works with a small extract of data, but with the full list of 400 people, this is what one gets: Introduction - Will you play APL with me ? < Ages) cum - (1∸cum,0) 56 32 56 104 63 38 37 14 All that without real programming, and it works whatever the number of people or categories. What luck! Once again, APL allowed us to find straightforward and original solutions to traditional problems. There Is a Lot to Discover Yet In the course of these pages we have flown over APL country and glimpsed certain bold ideas which explain the attraction of the language.

Introduction - Will you play APL with me ? 27 Dyalog APL has also its own powerful file system. These files are collections of arrays of any shapes or sizes, which can be processed with the full power of the language. Databases built with this special feature are extremely compact (2 to 3 times smaller than an equivalent relational database). They can be shared, and they offer much greater flexibility and superior performance compared to traditional database management systems. Build an Efficient Partnership With Microsoft Excel Microsoft Excel, probably the most popular spreadsheet manager, is used all over the world by millions of people.

In fact, you can execute several lines from the Session Log in one go. To mark a line for execution, you just have to change it in some way. You can make a real alteration, or a cosmetic change that has no material effect on the expression to be executed. As soon as you make any sort of modification to the line, the colour of the text (defined using the Colours dialog box) will change. You can undo a change and restore a line to its original state, by pressing Shift+Escape. To execute the marked lines press the Enter key.