for (var i = 0; i < width; i++) {
var x = x1 + i * xs;
var y = fn(x);
- data.push([x, y]);
+ var row = [x];
+ if (y.length > 0) {
+ for (var j = 0; j < y.length; j++) {
+ row.push(y[j]);
+ }
+ } else {
+ row.push(y);
+ }
+ data.push(row);
}
- g = new Dygraph(graph, data, { labels: ["x", "y"] });
+ g = new Dygraph(graph, data);
+ }
+
+ function preset() {
+ var sel = document.getElementById("presets").selectedIndex;
+ var id = document.getElementById("presets").options[sel].id;
+ var presets = {
+ 'id': [ -10, 10, 'function(x) {\n return x;\n}' ],
+ 'sine': [ -10, 10, 'function(x) {\n return Math.sin(x);\n}' ],
+ 'taylor': [ -3, 3, 'function(x) {\n return [Math.cos(x), 1 - x*x/2 + x*x*x*x/24];\n}' ],
+ 'sawtooth': [-10, 10, 'function(x) {\n var y = 0;\n for (var i = 1; i < 20; i+=2) {\n y += Math.sin(i * x)/i;\n }\n var final = 1 - 2*(Math.abs(Math.floor(x / Math.PI)) % 2);\n return [4/Math.PI * y, final];\n}' ]
+ };
+
+ if (id == "custom") { return; }
+ document.getElementById("x1").value = presets[id][0];
+ document.getElementById("x2").value = presets[id][1];
+ document.getElementById("eq").value = presets[id][2];
+ plot();
}
</script>
</head>
- <body>
+ <body onload="preset()">
<p><b>Equation: </b><br/>
<textarea cols="40" rows="10" id="eq">function(x) {
- return Math.sin(x);
-}</textarea>
+ return [0.1 * x, 0.1 * x + Math.sin(x), 0.1*x + Math.cos(x)];
+}</textarea><br/>
+<b>Preset functions:</b> <select id=presets onchange="preset()">
+<option id=custom>(custom)</option>
+<option id=id>Identity</option>
+<option id=sine>Sine Wave</option>
+<option id=taylor>Taylor series</option>
+<option selected id=sawtooth>Sawtooth</option>
+</select>
</p>
+
<p><b>x range: </b> <input type=text width="5" id="x1" value="-10" />
to <input type=text width="5" id="x2" value="10" /></p>
<p><input type=button value="Plot" onClick="plot()" /></p>
projects / dygraphs.git / commitdiff