写完就会出一堆错= =，我安的matlab r2009a(7.8.0),是安的时候的问题么？

Question

>> sym('3')??? Error using ==> mupadinit at 35Unable to initialize kernelError in ==> mupadengine.mupadengine>mupadengine.evalin at 117[res,status] = mupadmex(statement,8);Error in ==> sym.sym>sym.sym/scalarsym at 364[Schar,err] = evalin(symengine,x,'char');Error in ==> sym.sym>sym.sym/char2sym at 337Scell = scalarsym(x);Error in ==> sym.sym>sym.sym/symchar at 182Scell = char2sym(x);Error in ==> sym.sym>sym.sym at 120S = cell2sym(S,symchar(x,a,nargin));

Answer 1

sym函数可以生成单个的符号变量.如:sym x
当用sym生成多个符号变量时,MATLAB要报错.如:>>sym x y
Error using ==> sym.symSecond argument y not recognized.
syms函数的功能比sym函数更为强大,它可以一次创建任意多个符号变量.而且,syms函数的使用格式也很简单,使用格式如下:syms var1 var2 var3...如:syms x y z