[英]How to change array in struct to pointer in C
我有結構和功能:
#define MAX 4096
typedef struct{
char comment[40];
int nbpts;
float time[4096];
float value[4096];
} trace;
void simuTrace(int tmax, float dt, float params[], trace* uneTrace){
int i = 0;
float v = 0, w = 0, dv = 0, dw = 0, t = 0;
while (t<tmax && i < MAX){
dv = (params[0]-v)*(v-1)*v - w;
dw = params[4]*(params[1]*v-params[2]*w-params[3]);
v += dv*dt;
w += dw*dt;
uneTrace->time[i] = t;
uneTrace->value[i] = v;
i++;
t += dt;
}
uneTrace->nbpts = i+1;
uneTrace->comment[40]= "CommentaireDeLaTrace";
}
我想在這里更改結構,這不是限制MAX,但我不知道該怎么做。 如何通過新結構更改函數中的某些值
typedef struct{
char comment[40];
int nbpts;
float *time;
float *value;
} trace;
使用malloc
typedef struct{
char comment[40];
int nbpts;
float *time;
float *value;
} trace;
void simuTrace(int tmax, float dt, float params[], trace* uneTrace){
int i = 0;
float v = 0, w = 0, dv = 0, dw = 0, t = 0;
int count = tmax/dt;
uneTrace->time = malloc(count * sizeof(float));
uneTrace->value = malloc(count * sizeof(float));
while (i < count){
dv = (params[0]-v)*(v-1)*v - w;
dw = params[4]*(params[1]*v-params[2]*w-params[3]);
v += dv*dt;
w += dw*dt;
uneTrace->time[i] = t;
uneTrace->value[i] = v;
i++;
t += dt;
}
uneTrace->nbpts = i+1;
strcpy(uneTrace->comment, "CommentaireDeLaTrace");
}
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