行列の練習 - 経済統計練習帳

var bx,by;
var dx,dy;
var dt;
var cx,cy;
 
var ax, ay;
var a = new Array();
var b = new Array();
var sol = new Array();
 
function sample() {
 
cx=250;
cy=250;
 
bx = 350;
by = 360;
 
dx = 5;
dy = 2;
 
ax = bx - cx;
ay = by - cy;
 
ex = ay;
ey = -ax;
 
b[1] = dx;
b[2] = dy;
 
a[1] = new Array();
a[2] = new Array();
 
a[1][1] = ax;
a[2][1] = ay;
a[1][2] = ex;
a[2][2] = ey;
 
for(s=1;s<3;s++){
for(sx=1;sx<3;sx++){
z=a[sx][s]/a[s][s];
if(s==sx)z=0;
for(tx=1;tx<3;tx++){
a[sx][tx]=a[sx][tx]-z*a[s][tx];
}
b[sx]=b[sx]-z*b[s];
}
}
 
for(s=1;s<3;s++){
sol[s]=b[s]/a[s][s];
}
 
x1 = a[1][1] * sol[1] + a[1][2] * sol[2];
y1 = a[2][1] * sol[1] + a[2][2] * sol[2];
 
 
$("#memo").html(x1+","+y1);
 
 
}