Warning: Unable to display symbolic object because 'symengine' was reset. Repeat commands to regenerate result.

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Alexander Gaudreau 2024-4-10

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2105316-warning-unable-to-display-symbolic-object-because-symengine-was-reset-repeat-commands-to-regener

评论： Alexander Gaudreau 2024-4-11

Screenshot 2024-04-10 at 1.35.08 PM.png

Applying cramer's rule for a 2x2 matrix to solve for constants C_1 and C_2 but keeps returning "Unable to display symbolic object because 'symengine' was reset. Repeat commands to regenerate result". Hopefully not making an elementary error but recently updated to 2024a version and been having error message for other codes. I'm using syms, as I'm not provided with spring constant, n, or xi. Therefore I treat them as scalar variables. I appreciate any pointers/tips to resolve this problem. Thanks.

%Clamped and Rotational Spring

clc

clear all

format short g

syms k n xi

a = [(1-(k/2)), (1-k); (1/6), (1/2)];

x = [((k*(1)^(n+2))/((n)*(n+1)*(n+2)))-((1^(n+1))/((n)*(n+1))), (1-k); ((1)^(n+3))/((n)*(n+1)*(n+2)*(n+3)), 1/2];

y = [(1-(k/2)), ((k*(1)^(n+2))/((n)*(n+1)*(n+2)))-((1^(n+1))/((n)*(n+1))); 1/6, -((1^(n+3))/((n)*(n+1)*(n+2)*(n+3)))];

determinant_a = det(a)

determinant_a =

determinant_x = det(x)

determinant_x =

determinant_y = det(y)

determinant_y =

C_1 = determinant_x * (determinant_a)^-1

C_1 =

C_2 = determinant_y * (determinant_a)^-1

C_2 =

f = (((xi)^(n+3))/((n)*(n+1)*(n+2)*(n+3))) + (C_1)*(((xi)^(3))/(6)) + (C_2)*(((xi)^(2))/(2))

f =

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Alexander Gaudreau 2024-4-11

Can you provide link where to send request?

Torsten 2024-4-11

编辑：Torsten 2024-4-11

https://uk.mathworks.com/support/contact_us.html

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Answer 1

Harald 2024-4-11

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2105316-warning-unable-to-display-symbolic-object-because-symengine-was-reset-repeat-commands-to-regener#answer_1439736

Hi,

this seems to be due to a bug in R2024a which is fixed with the Update 1 release that is expected to become available to all users by end of next week (April 18).

The bug is specific to using Symbolic Math Toolbox together with clear all. I typically discourage using clear all as this clears more than necessary in most cases:

https://de.mathworks.com/help/matlab/ref/clear.html#btdyzbv-1-ItemType

If you still experience issues without using clear all or after installing the update release, please contact Technical Support for further investigation.

Best wishes,

Harald