Cody

# Problem 1632. Calculate the Number of Sign Changes in a Row Vector (No Element Is Zero)

Solution 2026316

Submitted on 18 Nov 2019 at 11:24
This solution is locked. To view this solution, you need to provide a solution of the same size or smaller.

### Test Suite

Test Status Code Input and Output
1   Pass
x = 1; y_correct = 0; assert(isequal(Sign_Changes(x),y_correct))

2   Fail
x =[7 1 2 -3]; y_correct =1; assert(isequal(Sign_Changes(x),y_correct))

Error using prod Dimension argument must be a positive integer scalar, a vector of unique positive integers, or 'all'. Error in Sign_Changes (line 4) if prod(x(k),x(k+1))<0 Error in Test2 (line 3) assert(isequal(Sign_Changes(x),y_correct))

3   Fail
x =[7 1 -2 3]; y_correct =2; assert(isequal(Sign_Changes(x),y_correct))

Error using prod Dimension argument must be a positive integer scalar, a vector of unique positive integers, or 'all'. Error in Sign_Changes (line 4) if prod(x(k),x(k+1))<0 Error in Test3 (line 3) assert(isequal(Sign_Changes(x),y_correct))

4   Fail
x =[-7 -1 -2 -3 -9 -8]; y_correct =0; assert(isequal(Sign_Changes(x),y_correct))

Error using prod Dimension argument must be a positive integer scalar, a vector of unique positive integers, or 'all'. Error in Sign_Changes (line 4) if prod(x(k),x(k+1))<0 Error in Test4 (line 3) assert(isequal(Sign_Changes(x),y_correct))

5   Pass
x =[5 6 7 8 9 9]; y_correct =0; assert(isequal(Sign_Changes(x),y_correct))

6   Fail
x =[-5 6 7 8 9 -9]; y_correct =2; assert(isequal(Sign_Changes(x),y_correct))

N = 1

Error using prod Dimension argument must be a positive integer scalar, a vector of unique positive integers, or 'all'. Error in Sign_Changes (line 4) if prod(x(k),x(k+1))<0 Error in Test6 (line 3) assert(isequal(Sign_Changes(x),y_correct))

7   Fail
x =[5 -6 7 -8 9 -9]; y_correct =5; assert(isequal(Sign_Changes(x),y_correct))

Error using prod Dimension argument must be a positive integer scalar, a vector of unique positive integers, or 'all'. Error in Sign_Changes (line 4) if prod(x(k),x(k+1))<0 Error in Test7 (line 3) assert(isequal(Sign_Changes(x),y_correct))

8   Fail
x =[-5 6 -7 8 -9 9]; y_correct =5; assert(isequal(Sign_Changes(x),y_correct))

N = 1

Error using prod Dimension argument must be a positive integer scalar, a vector of unique positive integers, or 'all'. Error in Sign_Changes (line 4) if prod(x(k),x(k+1))<0 Error in Test8 (line 3) assert(isequal(Sign_Changes(x),y_correct))