Write a function that counts the number of times n a signal x changes sign.
x = [1 2 -3 -4 5 6 -7 8 -9 10 11]
n = 6
x = [1 2 -3]
n = 1
It would be beneficial for the problem if zeros were added to test cases, for example [...,1,2,0,-1,-2,...], [...,1,2,3,0,2,3,...], [...1,2,3,0,0,0,1,2,...], [...,1,2,0,0,-1,-2,...], etc.
Additional test cases have been added and the description slightly modified.
Test for balanced parentheses
Fill a zeros matrix
Calculate the Number of Sign Changes in a Row Vector (No Element Is Zero)
Find a Pythagorean triple
Find the index of n in magic(n)
The Matrix Construction
stem and leaf plot
The Number of Ways
Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select: .
You can also select a web site from the following list:
Select the China site (in Chinese or English) for best site performance. Other MathWorks country sites are not optimized for visits from your location.
Contact your local office