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Hi; Can you help me to find fault in my code?

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SULE SAHIN
SULE SAHIN 2017-10-31
编辑： Walter Roberson 2018-6-12
Write a function called sort3 that takes a 3-element vector as its sole arguments. It uses if-statements, possibly nested, to return the three elements of the vector as three scalar output arguments in nondecreasing order, i.e., the first output argument equals the smallest element of the input vector and the last output argument equals the largest element. NOTE: Your function may not use any built-in functions, e.g., sort, min, max, median, etc.
My code;
function [s1 s2 s3] = sort3(V)
a = V(1), b = V(2), c = V(3);
if a<=b && a<=c
s1 = a;
if b<=c
s2 = b;
s3 = c;
else
s2=c;
s3=b;
end
else if b<=a && b<=c
s1=b;
if a<=c
s2=a;
s3=c;
else
s2=c;
s3=a;
end
else c<=b && c<=a
s1=c;
if b<=a
s2=b;
s3=a;
else
s2=a;
s3=b;
end
end
The fault;
>> [s1 s2 s3] = sort3([4 18 3])
Error: File: sort3.m Line: 3 Column: 5
At least one END is missing: the statement may begin here.
I dont understand this fault.

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回答（4 个）

KSSV
KSSV 2017-10-31
Type end at the end of the file.....
Walter Roberson
Walter Roberson 2017-10-31
Count nesting:
function [s1 s2 s3] = sort3(V)
a = V(1), b = V(2), c = V(3);
if a<=b && a<=c %enter nesting 1
s1 = a;
if b<=c %enter nesting 2
s2 = b;
s3 = c;
else %continue nesting 2
s2=c;
s3=b;
end %end nesting 2, resume nesting 1
else if b<=a && b<=c %continue nesting 1 with "else", enter nesting 2 with "if"
s1=b;
if a<=c %enter nesting 3
s2=a;
s3=c;
else %continue nesting 3
s2=c;
s3=a;
end %end nesting 3, resume nesting 2
else c<=b && c<=a %continue nesting 2 with "else". Print out the result of "c<=b && c<=a" because there is no "if" statement here
s1=c;
if b<=a %enter nesting 3
s2=b;
s3=a;
else %continue nesting 3
s2=a;
s3=b;
end %end nesting 3, resume nesting 2
end %end nesting 2, resume nesting 1
%uh-oh, we are at end of routine and still in nesting 1!
Please review "else if" compared to "else if"
Vignesh M
Vignesh M 2018-5-4
编辑：Walter Roberson 2018-5-4
function [u1,u2,u3] = sort3(v)
if v(1) <= v(2) && v(2) <= v(3);
u1=v(1);u2=v(2);u3=v(3);
elseif v(1) <= v(3) && v(3) <= v(2);
u1=v(1);u2=v(3);u3=v(2);
elseif v(2) <= v(1) && v(1) <= v(3);
u1=v(2);u2=v(1);u3=v(3);
elseif v(2) <= v(3) && v(3) <= v(1);
u1=v(2);u2=v(3);u3=v(1);
elseif v(3) <= v(1) && v(1) <= v(2);
u1=v(3);u2=v(1);u3=v(2);
else v(3) <= v(2) && v(2) <= v(1);
u1=v(3);u2=v(2);u3=v(1);
end
end
Dong Chen
Dong Chen 2018-6-11
编辑：Walter Roberson 2018-6-12
function [x y z] = sort3(m)
x = m(1);
y = m(2);
z = m(3);
if (x>y)
t = x;
x = y;
y = t;
end
if (x>z)
t = z;
z = x;
x = t;
end
if (y>z)
t = y;
y = z;
z = t;
end

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