The difference between Matrix-java and PHP calculation results

Matrixphpjava function

A method of calculating matrix weights
The input matrices are
{0, 2, 6, 1,-7},
{ -2,0,-5, 0,-5}
{ -6,5, 0, 8, 1}
{ -1,0,-8, 0, 7}
{7,5,-1,-7, 0}

This is the computational code for Java
Static double[] Weights=new double weights[5];
Private double computeciandweights (int[][] matrix) {
Double totalweight = 0;
for (int i = 0; i < weights.length; i++) {
Weights[i] = 1;
for (int j = 0; J < Weights.length; J + +)
Weights[i] *= decode (matrix[i][j]);
Weights[i] = Math.pow (Weights[i], (double) 1/weights.length);
Totalweight + = Weights[i];
}
for (int i = 0; i < weights.length; i++)
Weights[i]/= totalweight;
Double Eig = 0;
for (int i = 0; i < weights.length; i++) {
Double part = 0;
for (int j = 0; J < Weights.length; J + +)
Part + = decode (Matrix[i][j]) *weights[j];
Part/= Weights[i]*weights.length;
Eig + = part;
}
Return (eig-weights.length)/(WEIGHTS.LENGTH-1);
}

    private double decode(int num) {        if (num < 0)            return (double)1/(1-num);        else            return num+1;    }    然后结果是

ci=0.097302165775079
weights:0.10850015438106028
weights:0.056125161448460546
weights:0.45493710163432743
weights:0.06991685010726335
weights:0.3105207324288884
------------------------------------------------------------------------------------
This is the PHP calculation code.

function computeciandweights ($matrix,& $weights) {
$totalWeight = 0.0;
$len = 5;
for ($i =0; $i < $len; $i + +) {
$weights [$i]=1;
for ($j =0; $j < $len; $j + +) {
$weights [$i]*=decode ($matrix [$i] [$j]);
}
$weights [$i]=pow ($weights [$i],doubleval (1/$len));
$totalWeight +=doubleval ($weights [$i]);
}
for ($i =0; $i < $len; $i + +) {
$weights [$i]/= $totalWeight;
}
$eig = 0.0;
for ($i =0; $i < $len; $i + +) {
$part = 0.0;
for ($j =0; $j < $len; $j + +) {
$part +=decode ($matrix [$i] [$j]) * $weights [$j];
}
$part/= $weights [$i]* $len;
$eig + = $part;
}
Return ($eig-$len)/($len-1);
}
function decode ($num) {
if ($num <0) {
return Doubleval (1/(1-$num));
}else{
return $num +1;
}
}

$ci =computeciandweights ($inputMatrix, $weights);
Echo ' ci= '. $ci.
';
for ($i =0; $i echo ' weights= '. $weights [$i].
';
}

The result is
ci=0.0973021657751.
weights=0.106290974412.
weights=0.0549823927295.
weights=0.445674092399.
weights=0.0631581840822.
weights=0.329894356377.

The weight is calculated as the third digit after the decimal point is different.
Does this error belong to normal?
is the error caused by the calculation of floating-point numbers?

