The interface

The interface is a so-called consol interface witch means that you type your commands on the command line at the bottom of the program and you will see the result in the result field above. In the result field you will also see a blue arrow and the command you typed in.
At the far bottom is the status line. Here you can se how much memory your data variables use and a meter. The meter is used to see how much of a calculation that has been done. Most calculations are done so fast that the meter doesn't react before the calculations are finished.

Next: Basic calculations

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