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function replaceCommaWithDot() {
var sheet = SpreadsheetApp.getActiveSheet();
var range = sheet.getDataRange();
var values = range.getValues();
var numRows = values.length;
var numCols = values[0].length;
for (var i = 0; i < numRows; i++) {
for (var j = 0; j < numCols; j++) {
if (typeof(values[i][j]) === 'string') {
values[i][j] = values[i][j].replace(/,/g, '.');
}
}
}
range.setValues(values);
}