矩阵运算 创建n*m矩阵 extern double *mat(int n, int m) 1、n<=0 or m>=0 return NULL 2、内存分配错误 !(p=(double *)malloc(sizeof(double)*n*m)) fatalerr("matrix memory allocation error: n=%d,m=%d\n",n,m); 创建 n
原始 Markdown文档、Visio流程图、XMind思维导图见:https://github.com/LiZhengXiao99/Navigation-Learning 一、时间系统 double str2num(const char *s, int i, int n);int str2time(const char *s, int i, int n, gtime_t