Define the matrix with the command sym

>> sym_matrix = sym('[a,b,c;Jack,HelpMe,NOWAY]')

错误使用 sym>convertChar

Character vectors and strings in the first argument can only specify a variable or number. To evaluate character vectors and

strings representing symbolic expressions, use 'str2sym'.

出错 sym>tomupad (第 1481 行)

S = convertChar(x);

出错 sym (第 249 行)

S.s = tomupad(x);

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是不是想输入:

>> sym_matrix = str2sym('[a,b,c;Jack,HelpMe,NOWAY]')

sym_matrix =

[ a, b, c]

[Jack, HelpMe, NOWAY]

Answer 1

[Walter Roberson]

Up to roughly R2018a or so, it was valid to sym() a character string that represented an expression . Now it is only valid to sym() something numeric or to sym() a character string that represents a scalar numeric or to sym() a character string that represents a scalar variable name.

The replacement syntax is the str2sym() that you already found.

[童战]

Appreciate the assistance with my MATLAB question! Thank you!

Answer 2

[madhan ravi]

As it suggests 'Character vectors and strings in the first argument can only specify a variable or number.'

It can be a variable with subscripts as mentioned in the

 doc sym

Anyways seems like you have used the correct syntax using str2sym() at the end.

[童战]

Okey! Appreciate the assistance with my MATLAB question! Thank you!