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diff --git a/chapel.html.markdown b/chapel.html.markdown index 520f959d..e058bde9 100644 --- a/chapel.html.markdown +++ b/chapel.html.markdown @@ -837,6 +837,25 @@ sync { someSingleVar$ = 5; // first and only write ever. } } + +// we can define the operations + * & | ^ && || min max minloc maxloc +// over an entire array using scans and reductions +// Reductions apply the operation over the entire array and +// result in a single value +var listOfValues: [1..10] int = [456,354,15,57,36,45,15,8,678,2]; +var sumOfValues = + reduce listOfValues; +var maxValue = max reduce listOfValues; // give just max value +// gives max value and index of the max value +var (theMaxValue, idxOfMax) = maxloc reduce zip(listOfValues, listOfValues.domain); +writeln( (sumOfValues, maxValue, idxOfMax, listOfValues[ idxOfMax ] ) ); + +// Scans apply the operation incrementally and return an array of the +// value of the operation at that index as it progressed through the +// array from array.domain.low to array.domain.high +var runningSumOfValues = + scan listOfValues; +var maxScan = max scan listOfValues; +writeln( runningSumOfValues ); +writeln( maxScan ); ``` Who is this tutorial for? |