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Correct

20Size
Leading solution size is 14.
This solution is locked. To view this solution, you need to provide a solution of the same size or smaller.

Test Suite

Test
Code Input and Output
1
Pass
 
%%
% Courtesy of Aurelien Queffurust
filetext = fileread('quadratic.m');
assert(isempty(strfind(filetext, '*')),'sign * forbidden')
assert(isempty(strfind(filetext, 'mtimes')),'mtimes forbidden')
assert(isempty(strfind(filetext, 'cross')),'cross forbidden')
assert(isempty(strfind(filetext, 'prod')),'prod forbidden')
assert(isempty(strfind(filetext, 'cumprod')))
assert(isempty(strfind(filetext, 'times')))
assert(isempty(strfind(filetext, 'mldivide')))
assert(isempty(strfind(filetext, 'mrdivide')))
assert(isempty(strfind(filetext, '/')),'/ forbidden')
assert(isempty(strfind(filetext, '\')))
assert(isempty(strfind(filetext, '-')))
assert(isempty(strfind(filetext, '^')),'^ forbidden')
assert(isempty(strfind(filetext, 'dot')))
assert(isempty(strfind(filetext, '''')),'string forbidden')
assert(isempty(strfind(filetext, 'num2str')))
assert(isempty(strfind(filetext, 'int2str')))
assert(isempty(strfind(filetext, 'dec2bin')))
assert(isempty(strfind(filetext, 'roots')))

                    
2
Pass
 
%%
a=1;b=1;c=1;
rad=sqrt(b*b-4*a*c);
xe(1)=(-b+rad)/(2*a);
xe(2)=(-b-rad)/(2*a)
xq = quadratic(a,b,c)
assert(isequal(round(1e6*xq)/1e6,round(1e6*xe)/1e6) || isequal(round(1e6*xq(2:-1:1))/1e6,round(1e6*xe)/1e6))
xe =
  Column 1
 -0.500000000000000 + 0.866025403784439i
  Column 2
 -0.500000000000000 - 0.866025403784439i
ans =
  Column 1
 -0.500000000000000 + 0.866025403784438i
  Column 2
 -0.500000000000000 - 0.866025403784438i
xq =
  Column 1
 -0.500000000000000 + 0.866025403784438i
  Column 2
 -0.500000000000000 - 0.866025403784438i
3
Pass
 
%%
a=1;b=4;c=1;
rad=sqrt(b*b-4*a*c);
xe(1)=(-b+rad)/(2*a);
xe(2)=(-b-rad)/(2*a)
xq = quadratic(a,b,c)
assert(isequal(round(1e6*xq)/1e6,round(1e6*xe)/1e6) || isequal(round(1e6*xq(2:-1:1))/1e6,round(1e6*xe)/1e6))
xe =
  -0.267949192431123  -3.732050807568877
ans =
  -3.732050807568877  -0.267949192431123
xq =
  -3.732050807568877  -0.267949192431123
4
Pass
 
%%
a=1;b=4;c=1;
a=a+rand
rad=sqrt(b*b-4*a*c);
xe(1)=(-b+rad)/(2*a);
xe(2)=(-b-rad)/(2*a)
xq = quadratic(a,b,c)
assert(isequal(round(1e6*xq)/1e6,round(1e6*xe)/1e6) || isequal(round(1e6*xq(2:-1:1))/1e6,round(1e6*xe)/1e6))
a =
   1.760945615012275
xe =
  -0.286012800251771  -1.985494034428139
ans =
  -1.985494034428139  -0.286012800251771
xq =
  -1.985494034428139  -0.286012800251771