Assigning roots as variables to a function

2020 12 30
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更新时间：2020 12 31
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I have x^2+5*x+6=0.
I see the roots with the root command but i want to set them as variables to a new function. Also how can i set them to two different displays? I want to write down:
sprintf( 'the first root:%f and the second root:%f')

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Pat Gipper
Pat Gipper 2020-12-31

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The output of the roots function can be assigned to a workspace array variable and printed out as you wanted. See the simple example below. You would have to adapt the formatting for complex roots.
x=roots([1,5,6]);
sprintf('the first root:%f and the second root:%f',x)

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Walter Roberson
Walter Roberson 2020-12-31
Note: all of the % formats for sprintf() and fprintf() ignore the complex portion of a value, so if you are dealing with complex values you should use real() and imag() to break them into pieces,
John Blaz
John Blaz 2020-12-31
Thank you for your reply.
This is my script:
clc
clear
a=input('input the first number at x^2:');
b=input('input the second number at x:');
c=input('input the third number:');
[x1,x2]=ad(a,b,c);
sprintf('first root is: %f,second root is: %f',x1,x2)
And this is my function:
function [x1,x2] = ad(a,b,c)
%second degree equation
f=[a b c];
y=([roots(f)])
y(1)=x1
y(2)=x2
end
What am i doing wrong, in order toassign the roots to x1 and x2?
Pat Gipper
Pat Gipper 2020-12-31
You just need to swap variables y and x in the function assignment,
x1=y(1);
x2=y(2);

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