double sum(double **sum)
{
double result=0.0;
int k,l;

for(k=0;k<N;k++)
for(l=0;l<M;l++)
{
result+=sum[k][l]>0?sum[k][l]:(-sum[k][l]);
}

return result;
}

double subsum(double **sub1,double **sub2)
{
double subresult=0.0;
int m,n;

for(m=0;m<N;m++)
for(n=0;n<M;n++)
{
subresult+=(sub1[m][n]-sub2[m][n])>0?(sub1[m][n]-sub2[m][n]):(sub2[m][n]-sub1[m][n]);
}

return subresult;
}

void main()
{
...................
error = subsum(us,vx)/sum(us);\\us,vx，vs,vy是定义的动态数组
error1 = subsum(vs,vy)/sum(vs);
error = error +error1;
..........................................
}

这个程序运行时老是有错误，实在搞不懂，请教高手给讲解一下关于二维动态数组的问题，以及二维指针和二维数组做参数传递的问题．
上面这个程序如果改怎么改呢？？

这是提示的错误信息：

:\我的文档\program\lattice boltzmann code\正确程序(动态数组).cpp(493) : error C2664: 'subsum' : cannot convert parameter 1 from 'double *' to 'double [][51]'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
f:\我的文档\program\lattice boltzmann code\正确程序(动态数组).cpp(493) : error C2664: 'sum' : cannot convert parameter 1 from 'double *' to 'double [][51]'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
f:\我的文档\program\lattice boltzmann code\正确程序(动态数组).cpp(494) : error C2664: 'subsum' : cannot convert parameter 1 from 'double *' to 'double [][51]'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
f:\我的文档\program\lattice boltzmann code\正确程序(动态数组).cpp(494) : error C2664: 'sum' : cannot convert parameter 1 from 'double *' to 'double [][51]'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
Error executing cl.exe.

正确程序(动态数组).obj - 4 error(s), 0 warning(s)