swift算法手记-8

if answer==nil{
//计算方程的解
var p0:Double=leftbound!
var p1:Double=rightbound!
var q0:Double = comresult(p0)
var q1:Double = comresult(p1)
var p:Double=0
var q:Double=0

for i in 2...trycount{

p = secantcompresult(p0, myp1:p1)
if abs(p-p1) < accuracy {
answer=p0
break
}
q = comresult(p)
if q * q1 < 0 {
p0=p1
q0=q1
}
p1=p
q1=q

}
}
if let ans=answer{
//方程有解
result.stringValue="解："+String(stringInterpolationSegment: ans)+"   "
result.stringValue += "解代入方程的值："+String(stringInterpolationSegment:comresult(ans))
}

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