Modifying Footers - Display Which Columns Are Being Compared

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This rule adds a description of the sets of columns that are being compared by the Column Comparisons to the footer of the table.

Example

ComparisonsInFooter1.png

How to apply this rule

For the first time in a project

  • Select the table(s)/chart(s) that you wish to apply the rule to.
  • Start typing the name of the Rule into the Search features and data box in the top right of the Q window.
  • Click on the Rule when it appears in the QScripts and Rules section of the search results.

OR

  • Select Automate > Browse Online Library.
  • Choose this rule from the list.

Additional applications of the rule

  • Select a table or chart that has the rule and any table(s)/chart(s) that you wish to apply the rule to.
  • Click on the Rules tab (bottom-left of the table/chart).
  • Select the rule that you wish to apply.
  • Click on the Apply drop-down and choose your desired option.
  • Check New items to have it automatically applied to new items that you create. Use Edit > Project Options > Save as Template to create a new project template that automatically uses this rule.

Removing the rule

  • Select the table(s)/chart(s) that you wish to remove the rule from.
  • Press the Rules tab (bottom-right corner).
  • Press Apply next to the rule you wish to remove and choose the appropriate option.

How to modify the rule

  • Click on the Rules tab (bottom-left of the table/chart).
  • Select the rule that you wish to modify.
  • Click Edit Rule and make the desired changes. Alternatively, you can use the JavaScript below to make your own rule (see Customizing Rules).

JavaScript

// Report the sets of column comparisons in the footer
includeWeb("JavaScript Array Functions");
form.setSummary("Modifying Footers - Display Which Columns Are Being Compared");
 
if (table.availableStatistics.indexOf("Column Comparisons") == -1)
    form.ruleNotApplicable("column comparisons are not available on this table");
 
var column_names = table.get("Column Names");
var columns_compared = table.get("Columns Compared");
 
// Get list of spans. If there are no spans
// then make one big pseudo span. Any indices
// out side of spans are also included in a psuedo span
var spans = table.columnSpans;
if (spans.length == 0)
    spans = [{ indices: table.columnIndices(true), label: "" }];
else {
    var indices_included = [];
    var indices_not_in_spans = [];
    spans.forEach(function (span_obj) { indices_included = indices_included.concat(span_obj.indices) });
    for (var j = 0; j < table.numberColumns; j++) {
        if (indices_included.indexOf(j) == -1)
            indices_not_in_spans.push(j);
    }
    if (indices_not_in_spans.length > 1)
        spans.push({ indices: indices_not_in_spans, label: "Not in span" });
}
 
// Get text for all spans
var comparison_text = spans.map(generateComparisonText);
 
// Add to footer
var footers = table.extraFooters;
footers.push("Comparisons: " + comparison_text.join(", "));
table.extraFooters = footers;
 
// Generate the part of the footer that describes the comparisons
// in the specified span.
function generateComparisonText(span_obj) {
    // For each column, add the column name to the column comparisons, eg "A" + "BC" = "ABC"
    // Sort the string lexicographically (this helps eliminate duplicates later) and
    // separate the letters by "/". eg "A" + "CB" -> "ACB" -> "ABC" -> "A/B/C";
    var comparison_strings = span_obj.indices.map(function (index) {
        return (column_names[0][index] + columns_compared[0][index]).split("").sort().join("/");
    });
    // Remove any comparisons which are just one letter
    comparison_strings = comparison_strings.filter(function (s) { return s.length > 1; });
    // Remove duplicates
    comparison_strings = uniqueElementsInArray(comparison_strings);
    // If the span label is not empty then combine the span label with the set of comparisons,
    // otherwise just list the comparisons.
    return (span_obj.label == "" ? "" : span_obj.label + ": ") + comparison_strings.join(", ");
}

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