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Writing a one line programme to show that an equation equals to the answer shown.

NIMA RAHMANI MEHDIABADI さんによって質問されました 2019 年 3 月 19 日
最新アクティビティ John D'Errico
さんによって 回答されました 2019 年 3 月 19 日
How can i write a one line programme to show that sqrt(4) = 2 .
solve('sqrt(4)')
it says :
Error using solve>getEqns (line 418)
List of equations must not be empty.
Error in solve (line 226)
[eqns,vars,options] = getEqns(varargin{:});

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1 件の回答

回答者: John D'Errico
2019 年 3 月 19 日

Homework, but you did make an effort. Does this not show what you need to show?
sqrt(4)
ans =
2
Or this?
sqrt(4) == 2
ans =
logical
1
You were asked to show that statement to be true. Not to solve for the square root. Were you to try to do that, then you should arguably get BOTH branches of the square root. In one line, perhaps this...
solve(str2sym('x^2==4'))
ans =
-2
2
But I will argue that is not what was requested.

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