求和计算提示k没有定义 - 如图片所示，用求和计算以k为变量的函数，提示k没有定义，直接计算k是可以计算的 - Mensajes
#2 Publicado: 23/4/2026 7:52:13
There are a lot of terms involved, without a worksheet it's nearly impossible to understand what's the issue and how to solve it.
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#3 Publicado: 23/4/2026 13:16:13
Russia ☭ forever, Viacheslav N. Mezentsev
#4 Publicado: 23/4/2026 23:24:07
Hi. This is what the calculation of average driving power generally looks like, more or less.
IGBT Average Driving Power.sm
Regarding the error message, it might be because you're using `k` somewhere; the summation variable must be undefined. Try changing it to something else.
Best regards
Alvaro
IGBT Average Driving Power.sm
Regarding the error message, it might be because you're using `k` somewhere; the summation variable must be undefined. Try changing it to something else.
Best regards
Alvaro
Editado 23/4/2026 23:34:56
#5 Publicado: 24/4/2026 7:18:00
Editado 24/4/2026 7:21:01
#6 Publicado: 24/4/2026 9:40:52
Regarding the error message, it might be because you're using `k` somewhere; the summation variable must be undefined. Try changing it to something else.
This shouldn't be an issue anymore, I think it's more a operation order like Viacheslav pointed out.
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#7 Publicado: 24/4/2026 14:23:34
Hi Davide.
The user wrote: "Summation calculation prompt: 'k' is undefined - As shown in the image, when using the summation to calculate a function with 'k' as the variable, it prompts that 'k' is undefined, even though 'k' can be calculated directly." so I assume he is using an older version of SMath. In the latest version, k does not "go outside" the summation, as the user seems to be indicating.
Best regards.
Alvaro.
... This shouldn't be an issue anymore, I think it's more a operation order like Viacheslav pointed out.
The user wrote: "Summation calculation prompt: 'k' is undefined - As shown in the image, when using the summation to calculate a function with 'k' as the variable, it prompts that 'k' is undefined, even though 'k' can be calculated directly." so I assume he is using an older version of SMath. In the latest version, k does not "go outside" the summation, as the user seems to be indicating.
Best regards.
Alvaro.
#8 Publicado: 24/4/2026 16:36:02
Good point.
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#9 Publicado: 24/4/2026 18:46:58
Hi. Also, this is what the error looks like in the current version in case of incorrect parentheses: with a rounded box filled with red, in a more retina-damaging style
IGBT Average Driving Power - bad parenthisation.sm
Best regards.
Alvaro.
IGBT Average Driving Power - bad parenthisation.sm
Best regards.
Alvaro.
Editado 24/4/2026 18:51:16
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