C语言内存出现 -1.#IND00 是怎么回事？

[itfanr]

情景是这样的：

我仿真发送01数据，然后接收。当发送帧长为500时，假设发送1000次，都不出错，但是一旦帧长变成1024，就会偶然性（如果一直错误反而好了）出错。。

其中用到了几个double型的数组，函数调用前我都用动态数组了。但是我搞不明白，为什么出错时我查看数组中的数据，内存中变成了-1.#IND00 。。。


求大神帮忙，程序不大，如果需要我发你一份，帮我看看。感激涕零~~~~~

部分代码：

[txx]

我曾经在double 溢出的时候收到了这个......

[aoyoo]

“我仿真发送01数据”具体指的是什么呢？com口发送？socket发送？还是什么？

[itfanr]

@aoyoo 自己程序发送 不通过其他方式 send() receive() 函数而已 我做的通信算法

[xdeng]

贴出来看看啊

[xdeng]

越界？ 溢出？

[timonwong]

自己检查代码，-1.#IND就是NaN，常见于除数为0的错误

[itfanr]

@xdeng 怎么发私信？能告诉我你邮箱吗？

[itfanr]

@timonwong 可是为什么我500可以，1000就不行了。不可能出现除数为0的啊！

[timonwong]

@itfanr
那么我猜你发送、接收没有处理好，要么数据有丢失，要么数据有覆盖。你最好是在发送端Dump发送的数据（或者只Dump异常的数据），如果发送的数据也有异常，那么先暂时排除接收端的问题，检查发送端的代码（先检查浮点运算，再检查内存），浮点运算出现NaN，除了除以0，还有很多情况：取负数的平方根、0的0次方，0和正、负无穷相乘，等等等等，如果你有除法，检查被除数为0（这个为0不见得是等于0，具体要看epsilon，请查看IEEE754相关资料，快速了解的话请先看这篇： http://en.wikipedia.org/wiki/Machine_epsilon）。
另外所以要仔细查看有没有未初始化变量，或者变量的值被覆盖了（比如覆盖全`1`）。

[itfanr]

用到了两个主要文件，在main里面调用turbo_decode函数：
//部分main代码：
double ** soft_out ;
soft_out = (double **)malloc(sizeof(double *) * inter_num);

for (int soft_out_i =0; soft_out_i < inter_num ; soft_out_i++)
{
soft_out[soft_out_i] = (double *)malloc(sizeof(double)* frame_size);
}
turbo_decode(Lc ,g,ispunctured ,pattern ,decode_method ,receive ,soft_out) ;



//1.decode.cpp

#include "stdafx.h"
#include "tools.h"
#include <math.h>
#include <string.h>
#include "decode.h"
#include "decode.h"

void turbo_decode(double Lc ,int g[][4] ,int ispunctured ,const int pattern [] ,int decode_method ,const double * receive , double **soft_out){

if (ispunctured)//删余
{
//
}
else
{
/*double e_info [frame_size+3] ;
double die_info [frame_size+3] ;
double so [frame_size+3 ] ;
double so1 [frame_size+3] ;*/
double in1 [2][frame_size+3] ;
double in2 [2][frame_size+3] ;

for (int i=0; i<frame_size+3; i++)
{
in1[0][i] = receive[3 * i] ;
in1[1][i] = receive[3 * i + 1] ;
in2[1][i] = receive[3 * i + 2] ;
}

for(int i=0 ;i< frame_size+3 ; i++){
in2[0][i] = in1[0][pattern[i]-1];//交织 因为交织的数组为（1-1024，故减1）
}

double * e_info = (double *)malloc(sizeof(double) * (frame_size+3) );
double * die_info = (double *)malloc(sizeof(double) * (frame_size+3) );
double * so = (double *)malloc(sizeof(double) * (frame_size+3) );
double so1 [frame_size+3] ;

for (int i=0; i<frame_size+3; i++)
{
e_info[i] = 0 ;
}

for (int inter = 0 ; inter< inter_num; inter++)//开始迭代
{

// printf(" \n\n inter = %d\n\n ", inter) ;

for(int i=0 ;i< frame_size+3 ; i++){ //解交织
die_info [pattern[i]-1] = e_info[i] ;
}
// printf("before decoder 1---------die_info[0] = %lf \n", die_info[0] ) ;

maxLogMap(in1, g, Lc, (const double *)die_info, e_info, so) ; //

//rintf("after decoder 1---------e_info[0] = %lf \n", e_info[0] ) ;


for(int i=0 ;i< frame_size+3 ; i++){
die_info[i] = e_info[pattern[i]-1] ;//交织
}

// printf("before decoder 2---------die_info[0] = %lf \n", die_info[0] ) ;

maxLogMap(in2 , g, Lc, (const double *) die_info, e_info, so) ; //改变了e_info

//rintf("after decoder 2 ---------e_info[0] = %lf \n", e_info[0] ) ;

for(int i=0 ;i< frame_size+3 ; i++){ //解交织
so1 [(pattern[i]-1)] = so[i] ;
}

for (int i1 = 0 ; i1<frame_size ; i1++)//舍去最后的三个数字
{
soft_out[inter][i1] = so1[i1] ;
}

}

free(e_info) ;
e_info = NULL ;
free(die_info) ;
die_info = NULL ;
free(so) ;
so=NULL;
}//else 结束
}

void genTrellis(int g[][4],int lstate [][8] , int nstate [][8],int lpara[][8],int npara[][8]){

int k = 4 ;
int m =k-1 ;
int in = 0 ;
int state_temp [3] ;//input0和input1都用
int state[3] ;//input0和input1都用

int *gp1 = &g[0][1] ;//g(1,2:end)
int *gp2 = &g[1][0] ;//g(2,:)
int para = 0 ;
int state0_temp1 [4] ;
int state0_temp2[3] ;

int state1_temp1[4] ;
int state1_temp2[3] ;
int nstate_index ;

for (int i=0 ;i<8 ;i++ )
{
de2bi(i,state_temp) ;

//input 0
fliplr(state,state_temp,3) ;
in = (matrix_Mul(gp1,state,3)%2)^0 ;
state0_temp1[0] = in ;
for (int j = 1; j<4 ; j++)
{
state0_temp1[j] = state[j-1] ;
}
para = matrix_Mul(gp2,state0_temp1,4)%2 ;
right_shift(in,state,3) ;

fliplr(state0_temp2,state,3) ;
nstate_index = bi2de(state0_temp2, 3) ;
nstate[0][i] = nstate_index +1 ;
lpara[0][nstate_index] = 2 * para -1 ;
lstate[0][nstate_index] = i+1 ;


//input 1
fliplr(state,state_temp,3) ; //重置state
in = (matrix_Mul(gp1, state,3)%2)^1 ;
state1_temp1[0] = in ;
for (int j = 1; j<4 ; j++)
{
state1_temp1[j] = state[j-1] ;
}
para = matrix_Mul(gp2,state1_temp1,4 )%2 ;
right_shift(in,state,3) ;

fliplr(state1_temp2, state, 3) ;
nstate_index = bi2de(state1_temp2, 3);
nstate[1][i] = nstate_index +1 ;
lpara[1][nstate_index] = 2* para - 1 ;
lstate[1][nstate_index] = i+1 ;
}
//以下产生npara

for (int i = 0 ; i<2 ;i++)
{
for (int j=0; j<8; j++)
{
//找到上一个状态
int state_temp ;
state_temp = lstate[i][j] ;
int para_temp ;
para_temp = lpara[i][j] ;
npara[i][state_temp-1] = para_temp ;
}
}

}

2.subdecode.cpp

#include "stdafx.h"
#include "tools.h"
#include <math.h>
#include "decode.h"

double maxVect(const double vect[], int vect_len) ;
void maxLogMap(const double input[][frame_size+3] , int g[][4],double Lc,const double * pri_info, double * e_info, double *so ) {
//产生网格
int lstate [2][8];
int nstate [2][8] ;
int lpara [2][8] ;
int npara [2][8] ;

genTrellis(g, lstate , nstate, lpara, npara) ;

//主要译码部分
const int nstates = 8 ;
//alpha beta gamma 初始化
double alpha[frame_size +3][nstates] , beta[frame_size +3+1][nstates] ;
double gamma0[frame_size +3][nstates], gamma1[frame_size +3][nstates] ;

const int infinity = 1000 ;
alpha[0][0] = 0 ;
for (int st = 1; st<nstates; st++)
{
alpha [0][st] = -infinity ;//初始化第1行
}
//beta
double log_temp = 1.0/8 ;
for (int beta_col = 0; beta_col<nstates; beta_col++ )
{
beta[frame_size +3][beta_col] = log(log_temp) ; //初始化最后一行
}
//------------------------------------------------------------------------------------

for (int i = 0; i<frame_size +3; i++)
{
for (int st = 0; st<nstates; st++)
{
double mul_temp ;
mul_temp = -1 * input[0][i] + lpara[0][st] * input[1][i] ; //输入0
gamma0[i][st] = -1 * pri_info[i]/2 + Lc/2 * mul_temp ;

mul_temp = 1 * input[0][i] + lpara[1][st] * input[1][i] ; //输入1
gamma1[i][st] = pri_info[i]/2 + Lc/2 * mul_temp ;
}

}

//--------------------------------------------------------------------------------------

for (int i = 1; i<frame_size +3; i++)
{
int lstate_temp1 ,lstate_temp2 ;
double data0 ,data1 ;
for (int st = 0; st<nstates; st++ )
{
lstate_temp1 = lstate[0][st] -1;
data0 = gamma0[i-1][st] + alpha[i-1][lstate_temp1] ;

lstate_temp2 = lstate[1][st]-1 ;
data1 = gamma1[i-1][st] + alpha[i-1][lstate_temp2] ;

alpha[i][st] = (data0>data1 ? data0 :data1 );

}
}
//------------------------------------------------------------------------------------------------------------

for (int i = frame_size +3-1; i>0 ; i--)
{
int data0, data1 ;
int nstate_temp0,nstate_temp1 ;
for (int st = 0 ; st<nstates; st++)
{
nstate_temp0 = nstate[0][st] -1;
data0 = gamma0[i][nstate_temp0] + beta[i+1][nstate_temp0] ;

nstate_temp1 = nstate[1][st] -1;
data1 = gamma1[i][nstate_temp1] + beta[i+1][nstate_temp1] ;

beta[i][st] = (data0>data1 ? data0 :data1 );

}
}

//----------------------------------------------------------------------------------------------------------------
double temp0[nstates] = {0} ;
double temp1[nstates] ={0 };
double so_temp [frame_size+3] = {0};

for (int i=0; i<frame_size +3; i++)
{
int lstate_temp1, lstate_temp2 ;
for (int st = 0 ; st<nstates; st++)
{
lstate_temp1 = lstate[0][st] -1 ;
lstate_temp2 = lstate[1][st] -1;

temp0[st] = gamma0[i][st] + alpha[i][lstate_temp1] + beta[i+1][st] ;
temp1[st] = gamma1[i][st] + alpha[i][lstate_temp2] + beta[i+1][st] ;
}
so_temp [i] = maxVect(temp1,nstates) - maxVect(temp0, nstates) ;

}

//----------------------------------------------------------------------------

for (int i =0; i<frame_size+3; i++)
{
so[i] = so_temp[i] ;
}

for (int i = 0; i<frame_size +3; i++)
{
e_info[i] = so[i] - pri_info[i] - Lc * input[0][i] ;
}


}

double maxVect(const double vect[], int vect_len){

double max = vect[0] ;
int i = 1 ;
while (i<vect_len)
{
if(vect[i]>=max ){
max = vect[i] ;
}
i++ ;
}
return max ;
}

[itfanr]

@xdeng 代码我贴了

[itfanr]

@timonwong 代码我贴了

[detailyang]

...你应该帖glist上 这样看起来舒服。。

[itfanr]

@detailyang glist是什么？我也想高亮啊 这里不行 很郁闷

[blueandhack]

@itfanr http://www.v2ex.com/t/74249#reply36 这么贴代码