-
-
Save Dzinlife/36361eb213bf36073f7ddede084376cf to your computer and use it in GitHub Desktop.
定積分計算機
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
<html> | |
<head> | |
<meta http-equiv="content-type" content="text/html; charset=UTF-8" /> | |
<link href="./css/index.css" rel="stylesheet" type="text/css" /> | |
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script> | |
<script type="text/javascript"> | |
$(document).ready(function() { | |
$("#enzan").click( function() { | |
var a = $("#start").val(); | |
var b = $("#end").val(); | |
var fx = $("#siki").val(); | |
var n = 10000; | |
var s; | |
if( jQuery.isNumeric(a) || jQuery.isNumeric(b) ) | |
{ | |
a = Number(a); | |
b =Number(b); | |
var h = ( b - a ) / (2*n); | |
var i=0; | |
x = new Array(2*n+1); | |
xx = new Array(2*n+1); | |
y = new Array(2*n+1); | |
yy=0; | |
var fxx; | |
while(i <= 2*n) | |
{ | |
x[i] = (a+h*i); | |
i++; | |
} | |
i = 0; | |
fxx = fx.replace(/x/g, "x[i]"); | |
while(i <= 2*n) | |
{ | |
y[i] = eval(fxx); | |
i++; | |
} | |
i = 0; | |
while(i<=(2*n)) | |
{ | |
if( i == 0 || i == 2*n) | |
{ | |
yy = yy + y[i]; | |
} | |
else if( i % 2 == 1) | |
{ | |
yy = yy + 4*y[i]; | |
} | |
else | |
{ | |
yy = yy + 2*y[i]; | |
} | |
i++; | |
} | |
s = h/3 * yy; | |
$("#kekka").html("<font size='4'><b>S="+s+"</b></font>"); | |
} | |
else | |
{ | |
alert("範囲が数値でない"); | |
} | |
}); | |
}); | |
</script> | |
</head> | |
<body> | |
<table border="5"> | |
<tr> | |
<td><font size="5"><b>シンプソン法での定積分</b></font></td> | |
</tr> | |
<tr> | |
<td>始点:a <input type="text" value="a" id="start" /></td> | |
</tr> | |
<tr> | |
<td>終点:b <input type="text" value="b" id="end" /></td> | |
</tr> | |
<tr> | |
<td>関数:f(x) <input type="text" value="f(x)" id="siki" /></td> | |
</tr> | |
<tr> | |
<td><button id="enzan" />計算</button></td> | |
</tr> | |
<tr> | |
<td><span id="kekka" /></td> | |
</tr> | |
</table> | |
</body> | |
</html> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment