请问为什么如果公式很长的话,在求偏导会出现无法诠释的提示呢?是mathematica无法接受公式过长呢?截图如下所示,还有代码的纯文本复制,请各位大佬帮帮忙,先谢过了。
(注:括号之前是有空格,代表✖的,代码也检查了几遍,没有问题)
纯文本:D[((a - a b) (-2 - 2 b + 2 r1 + b r1 + b r2) (-1 + r2) + (-2 - 2 b + b r1 + 2 r2 + b r2) (-c + b c))/(4 - 4 b^2 - 4 r1 + 4 b^2 r1 - b^2 r1^2 - 4 r2 + 4 b^2 r2 + 4 r1 r2 - 2 b^2 r1 r2 - b^2 r2^2), r1]
LaTeX:
\frac{\partial \frac{(\text{r2}-1) (a-a b) (b \text{r1}+b \text{r2}-2 b+2 \text{r1}-2)+(b c-c) (b \text{r1}+b \text{r2}-2 b+2 \text{r2}-2)}{b^2 \left(-\text{r1}^2\right)-2 b^2 \text{r1} \text{r2}+4 b^2 \text{r1}-b^2 \text{r2}^2+4 b^2 \text{r2}-4 b^2+4 \text{r1} \text{r2}-4 \text{r1}-4 \text{r2}+4}}{\partial \text{r1}}
截图:
(注:括号之前是有空格,代表✖的,代码也检查了几遍,没有问题)
纯文本:D[((a - a b) (-2 - 2 b + 2 r1 + b r1 + b r2) (-1 + r2) + (-2 - 2 b + b r1 + 2 r2 + b r2) (-c + b c))/(4 - 4 b^2 - 4 r1 + 4 b^2 r1 - b^2 r1^2 - 4 r2 + 4 b^2 r2 + 4 r1 r2 - 2 b^2 r1 r2 - b^2 r2^2), r1]
LaTeX:
\frac{\partial \frac{(\text{r2}-1) (a-a b) (b \text{r1}+b \text{r2}-2 b+2 \text{r1}-2)+(b c-c) (b \text{r1}+b \text{r2}-2 b+2 \text{r2}-2)}{b^2 \left(-\text{r1}^2\right)-2 b^2 \text{r1} \text{r2}+4 b^2 \text{r1}-b^2 \text{r2}^2+4 b^2 \text{r2}-4 b^2+4 \text{r1} \text{r2}-4 \text{r1}-4 \text{r2}+4}}{\partial \text{r1}}
截图: