matlab-字串与数字转换,执行字符串和函数
?数字转字符
?
>> a=111
a =
?? 111
>> mat2str(a,'class')
ans =
double(111)
>> class(a)
ans =
double
>> num2str(a,'%10.2e')
ans =
1.11e+002
>>
?
?
字符转数字
>> double('abcdef')
ans =
??? 97??? 98??? 99?? 100?? 101?? 102
>>
>> str2num('66.123')
ans =
?? 66.1230
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?
执行字符串
?
>> eval('666+99/2')
ans =
? 715.5000
?
>> eval('aa=23455')
aa =
?????? 23455
>>
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执行函数
>> help feval
?FEVAL Execute the specified function.
??? FEVAL(F,x1,...,xn) evaluates the function specified by a function
??? handle or function name, F, at the given arguments, x1,...,xn.
??? For example, if F = @foo, FEVAL(F,9.64) is the same as foo(9.64).
?
??? If a function handle is bound to more than one built-in or
??? M-file, (that is, it represents a set of overloaded functions),
??? then the data type of the arguments x1 through xn, determines
??? which function is executed.
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??? FEVAL is usually used inside functions which take function
??? handles or function strings as arguments.? Examples include
??? FZERO and EZPLOT.
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??? [y1,..,yn] = FEVAL(F,x1,...,xn) returns multiple output arguments.
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??? Within methods that overload built-in functions, use BUILTIN(F,...)
??? to execute the original built-in function.? Note that when using
??? BUILTIN, F must be a function name and not a function handle.
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