1 files changed, 36 insertions, 1 deletions
diff --git a/client/lib/util.js b/client/lib/util.js
index e47b343..0685b9d 100644
--- a/client/lib/util.js
+++ b/client/lib/util.js
@@ -13,6 +13,7 @@ const browser = { isIphone, isIpad, isMobile, isDesktop }
 
 function choice (a){ return a[ Math.floor(Math.random() * a.length) ] }
 function mod(n,m){ return n-(m * Math.floor(n/m)) }
+function norm(n, min, max){ return (n - min) / (max - min) }
 
 function requestAudioContext (fn) {
 	if (isMobile) {
@@ -92,5 +93,39 @@ function tap (fn) {
   }
 }
 
-export { choice, mod, browser, requestAudioContext, ftom, mtof, tap, dataURItoBlob }
+/* get minimum and maximum variance from row-to-row */
+
+function get_diff_bounds(rows){
+  const diffs = rows.map(row => {
+    const row_min = Math.min.apply(Math, row)
+    const row_max = Math.max.apply(Math, row)
+    return row_max - row_min
+  })
+  const min = Math.min.apply(Math, diffs)
+  const max = Math.max.apply(Math, diffs)
+  return { min, max }
+}
+
+/* get minimum and maximum values from a dataset */
+
+function get_bounds(dataset){
+  let rows = dataset.lines
+  // rows.forEach(row => row.shift())
+  rows = rows.map(a => a.map(n => parseFloat(n)))
+  const max = rows.reduce((a,b) => {
+    return b.reduce((z,bb) => {
+      return Math.max(z, bb)
+    }, a)
+  }, -Infinity)
+  const min = rows.reduce((a,b) => {
+    return b.reduce((z,bb) => {
+      return Math.min(z, bb)
+    }, a)
+  }, Infinity)
+  return { rows, max, min }
+}
+
+
+
+export { choice, mod, norm, browser, get_bounds, get_diff_bounds, requestAudioContext, ftom, mtof, tap, dataURItoBlob }