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 - Messages
#2 Posted: 4/23/2026 7:52:13 AM
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 Posted: 4/23/2026 1:16:13 PM
Russia ☭ forever, Viacheslav N. Mezentsev
#4 Posted: 4/23/2026 11:24:07 PM
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
Edited 4/23/2026 11:34:56 PM
#5 Posted: 4/24/2026 7:18:00 AM
Edited 4/24/2026 7:21:01 AM
#6 Posted: 4/24/2026 9:40:52 AM
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 Posted: 4/24/2026 2:23:34 PM
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 Posted: 4/24/2026 4:36:02 PM
Good point.
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#9 Posted: 4/24/2026 6:46:58 PM
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.
Edited 4/24/2026 6:51:16 PM
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