[問題] 動態宣告陣列 --- 第一維未知
x1 x2 x3 x4
y [0] 1 2 3 4
y [1] 2 3 4 5
.
.
.
while(讀資料)
{
data=(double **)malloc(sizeof(double *));
data[i]=(double *)malloc(sizeof(double)*4);
...
}
有讀到下一行，才會有下個y
所以幾列是不確定
如果我不想將xy反轉的方式來作
有什麼方法可以動態宣告，讓第一維長度擴大？？
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