Created
March 12, 2013 18:15
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Generate Sankey data for Google Sheets with this custom formula
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function setSankey(data, cols, optSplit) { | |
// data - is all columns of the the response data minus the header e.g. 'Form Responses'!A2:P | |
// cols - string of comma seperated column letters | |
var splitBy = optSplit || ", "; | |
var output = [["source","target","value"]]; | |
var edges = {}; | |
var cols = cols.split(","); | |
for (i in cols){ | |
cols[i] = charToCol(cols[i].trim().toUpperCase()); | |
} | |
for (var c = 0; c < cols.length-1; c++){ | |
for (i in data){ | |
var sources = data[i][cols[c]].split(splitBy); | |
for (s in sources){ | |
if (sources[s] !=""){ | |
var targets = data[i][cols[c+1]].split(splitBy); | |
for (t in targets){ | |
if (targets[t] !=""){ | |
if (edges[sources[s]+"|"+targets[t]] == undefined){ | |
edges[sources[s]+"|"+targets[t]] = {source:sources[s], | |
target: targets[t], | |
value: 1}; | |
} else { | |
edges[sources[s]+"|"+targets[t]].value = edges[sources[s]+"|"+targets[t]].value+1; | |
} | |
} | |
} | |
} | |
} | |
} | |
} | |
for (i in edges){ | |
output.push([edges[i].source,edges[i].target,edges[i].value]); | |
} | |
return output; | |
} | |
// http://stackoverflow.com/a/9906193/1027723 | |
function charToCol(val) { | |
var base = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', i, j, result = 0; | |
for (i = 0, j = val.length - 1; i < val.length; i += 1, j -= 1) { | |
result += Math.pow(base.length, j) * (base.indexOf(val[i]) + 1); | |
} | |
return result-1; | |
}; |
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