program for checking whether the root satisfies an equation

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Sukhversha Luthra 2018-1-2

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https://ww2.mathworks.cn/matlabcentral/answers/375202-program-for-checking-whether-the-root-satisfies-an-equation

编辑： Jan 2018-1-2

I am unable to make a program for the following problem.

Suppose I have 5 numbers (eg. 1, 2, 3, 4, 5) and I want to check whether these numbers are the roots of a particular equation(say x^2-7*x+10=0) or not. and I want to pick the numbers (or display the satisfying roots). please help.

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Answer 1

Jan 2018-1-2

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/375202-program-for-checking-whether-the-root-satisfies-an-equation#answer_298369

编辑：Jan 2018-1-2

在 MATLAB Online 中打开

Or without the Symbolic Toolbox

fcn = @(x) x .^ 2 - 7 * x + 10;
x   = [1, 2, 3, 4, 5];
f_x = fcn(x)
isroot = abs(f_x < sqrt(eps));  % The limit depends on the equation and actual problem
x(isroot)