To display the variable, the class methods at the MATLAB level would construct a call evalin(symengine, '_print(_SYM_2783_19258_430)' which would examine the expression associated with _SYM_2783_19258_430 and figure out how to format it and would return an appropriate character vector. If, for example, you were to define A = sqrt(sym(2)) + sym(1).then the component that lives at the MATLAB level would just know that it was a symbolic object with internal reference something like _SYM_2783_19258_430 and would not know anything about the content. The keyfunction subs (which stands for substitute) is for replacing symbolic variables with either new symbolic variables or with acutal values. The MATLAB level makes no attempt to track the values of the contents of symbolic variables or their printable representations. Here is an example for creating a symbolic function for (aX2) + (bx) + c: > syms a b c x define the symbolic math variables > f sym('ax2 + bx + c') Evaluation of Symbolic Expressions. When the symbolic variable is referred to at the MATLAB level, then the class methods create character vectors of commands, substituting those special variable names for each variable, and passing the constructed command to the symbolic engine. The character vector in turn contains a special variable name in a format that is not a legal MATLAB variable name. All of your MATLAB commands are stored in the M-file, which is a plain text file. What are different file types in Matlab The native file extensions for MATLAB are.

It's worth noting that variables aren't saved by default. Normally if you write a, matlab displays the numeric value that is in this variable. It has variables that you've generated or that you've imported from other systems. and every time I write a in the command windows, matlab cacht the numeric value of c and the numeric value of b of the worspace variable and a sum them. The component that lives at the MATLAB level is an object that mostly says 'This is a symbolic variable', and which internally contains a character vector. But I would like that a keeps the symbolic expression instead of the numeric value.

Matlab symbolic variables