error in my code

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justin Taylor
justin Taylor 2011-12-29
syms x;
f=x^2+x;
M=solve(f);
n=size(M,2);
for i=1:n
if M(i)>1
disp('Ok');
else
disp('Again');
end
end
it show :
>> d
Nhap ham fx^2+x
Error using sym>notimplemented (line 2682)
Function 'gt' is not implemented for MuPAD symbolic
objects.
Error in sym/gt (line 801)
notimplemented('gt');
Error in d (line 5)
if M(i)>1

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采纳的回答

Walter Roberson
Walter Roberson 2011-12-29
M = double(solve(f));

更多回答（1 个）

Sean de Wolski
Sean de Wolski 2011-12-29
That's why input is seldomly recommended, especially when you plan on using the result in something important, like solve.
Recommended steps:
  1. Write a function that excepts one input argument
  2. Give this function some error checking to make sure that the one input argument meets the criteria for solve
  3. Do the rest of the stuff and output a reult.
doc function %will be your friend.

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