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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http://blog.csdn.net/myhaspl/