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Undefined function or variable 'assume', is it possible that my 'assume' function has been removed?

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saeed shekari
saeed shekari 2018-5-6
评论： Walter Roberson 2018-5-21
I've encountered with error Undefined function or variable 'assume' although i have used it many times before,
i used these commands below:
restoredefaultpath
rehash toolboxcache
but nothing changed, is it possible that my 'assume' function has been removed and if yes, what should i do?

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采纳的回答

Walter Roberson
Walter Roberson 2018-5-7
If you got through
syms
but fail on assume(), then either your installation is corrupt or you have the Maple based symbolic engine installed. The Maple symbolic engine was the symbolic engine up to R2007a (I think it was). The Maple symbolic engine can end up getting installed if you install the Maple software package (from Maplesoft) and you let the Maple installer install the "MATLAB Connector for Maple".
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Guodong Liang
Guodong Liang 2018-5-21
编辑：Guodong Liang 2018-5-21
Hello, I got the same problem with this function 'assume'.
I have add this line in my codes
rmpath('C:\Program Files\MATLAB\R2017a\toolbox\maple')
but then when I run this codes, it returns
Undefined function or variable 'syms'.
I have also tried
rmpath('C:\Program Files\MATLAB\R2017a\toolbox\maple') addpath('C:\Program Files\MATLAB\R2017a\toolbox\symbolic')
but it also doesn't work. Could you please tell me what should I do in this case?
Walter Roberson
Walter Roberson 2018-5-21
It has been a while, but I seem to recall that if you look in C:\Program Files\MATLAB\R2017a\toolbox\maple that there should be an uninstaller executable that will remove the MATLAB Connector for Maple. You might need to (re-) install Mathworks' Symbolic Toolbox after that.

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更多回答（1 个）

Ameer Hamza
Ameer Hamza 2018-5-6
编辑：Ameer Hamza 2018-5-6
You cannot call assume() without input arguments. Use it like this
syms x
assume(x>0);
  2 个评论
saeed shekari
saeed shekari 2018-5-7
编辑：Walter Roberson 2018-5-7
I have used 'assume' function as follows:
syms b11 b12 b13 b21 b22 b23 b31 b32 b33 b41 b42 b43 h1 h2 h3
assume([b11 b12 b13 b21 b22 b23 b31 b32 b33 b41 b42 b43 h1 h2 h3],'real')
i had used it many times before and it was working, but now it shows the error below:
Undefined function or variable 'assume'. Error in project1 (line 4) assume([b11 b12 b13 b21 b22 b23 b31 b32 b33 b41 b42 b43 h1 h2 h3],'real')

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