如何将数组中的特定元素内容存储到另一个数组？ [英] how to get specific element content in an array an store to another array ?

问题描述

int thresholdcount,PZLoctn_counter;
float *PZdemo;
for(thresholdcount=0;thresholdcount<sample_length;thresholdcount++)
{
 if(thxcross_pos[thresholdcount]==1)
	{
	//PZLoctn[thresholdcount]=thxcross_pos[thresholdcount];
	PZLoctn[thresholdcount]=thresholdcount;
	printf("pzloctn:%f\n",PZLoctn[thresholdcount]);
	PZdemo=PZLoctn[thresholdcount];
	PZLoctn_counter=PZLoctn_counter+1;	
	}

}
for(thresholdcount=0;thresholdcount<PZLoctn_counter;thresholdcount++)
{
printf("%f\n",PZdemo[thresholdcount]);
}

这个我有一个数组（thxcross_pos [sample_length]）里面有元素，这里我也创建了一个更多数组（PZLoctn [PZLoctn_counter]），其大小可能因条件而异，这里我打算将thxcross_pos [] == 1的索引存储到PZLoctn [] den到PZdemo

in this i have an array(thxcross_pos[sample_length]) which contents elements and here i have also create one more array(PZLoctn[PZLoctn_counter]) whose size may varies according to the condition, here i am planning to store the index of thxcross_pos[]==1 into PZLoctn[] den to PZdemo

推荐答案

问题似乎是你没有为PZDemo分配内存。检查以下代码作为起点

The problem seems that you have not allocated memory to PZDemo. Check below code for your starting point

int thresholdcount,PZLoctn_counter;
float *PZdemo = new float[sample_length];
for(thresholdcount=0;thresholdcount<sample_length;thresholdcount++)
{
 if(thxcross_pos[thresholdcount]==1)
    {
    //PZLoctn[thresholdcount]=thxcross_pos[thresholdcount];
    PZLoctn[thresholdcount]=thresholdcount;
    printf("pzloctn:%f\n",PZLoctn[thresholdcount]);
    PZdemo=PZLoctn[thresholdcount];
    PZLoctn_counter=PZLoctn_counter+1;
    }

}
for(thresholdcount=0;thresholdcount<PZLoctn_counter;thresholdcount++)
{
printf("%f\n",PZdemo[thresholdcount]);
}

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