Can a Comma Separated List be Generated Directly from a sym Array?
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Can a comma separated list be generated directly from a sym array for use as input to a sym function?
>> xvar=sym('x',[1 4])
xvar =
[ x1, x2, x3, x4]
>> yvar=sym('y',[1 4])
yvar =
[ y1, y2, y3, y4]
>> f(xvar)=sum(xvar)
f(x1, x2, x3, x4) =
x1 + x2 + x3 + x4
>> f(yvar)
Error using symfun/subsref (line 177)
Symbolic function expected 4 input arguments but received 1.
>> temp=num2cell(yvar);
>> f(temp{:})
ans =
y1 + y2 + y3 + y4
Baically, is there a way evaluate f at the elements of yvar without having to create the temp variable, as needed for generailized code where the lengths of xvar and yvar are not known ahead of time?
采纳的回答
Can a comma separated list be generated directly from a sym array for use as input to a sym function?
NO. But you can do it without an explicit temporary variable.
xvar=sym('x',[1 4]);
yvar=sym('y',[1 4]);
f(xvar) = sum(xvar);
f(struct('v', num2cell(yvar)).v)
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