A non-zero vector is one with at least one non-zero entry, at least in R n or C n. In general, a non-zero vector is one that is not the identity element for addition of the vector space in question. As we use [1,1,1] as structuring element, zero-padding by 1 is sufficient: Now we do the opening to remove all small nonzero sequences. Indigenous Experience, Environmental Justice And Settler Colonialism, Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | logical | duration | calendarDuration https://www.mathworks.com/matlabcentral/answers/129868-count-a-vector-with-continuous-non-zero-elements, https://www.mathworks.com/matlabcentral/answers/129868-count-a-vector-with-continuous-non-zero-elements#answer_137030, https://www.mathworks.com/matlabcentral/answers/129868-count-a-vector-with-continuous-non-zero-elements#comment_214125, https://www.mathworks.com/matlabcentral/answers/129868-count-a-vector-with-continuous-non-zero-elements#comment_214127, https://www.mathworks.com/matlabcentral/answers/129868-count-a-vector-with-continuous-non-zero-elements#answer_137032. Create a matrix and determine how many elements are greater than 10. In the popped up Select Specific Cells dialog box, select Cell in the Selection type section, specify Does not equal in the Specific type drop-down list, and enter number 0 into the blank box. If this is set to True, the axes that are counted are left // count_if example #include // std::cout #include // std::count_if #include // std::vector bool IsOdd (int i) { return ((i%2)==1); } int main { std::vector myvector; for (int i=1; i<10; i++) myvector.push_back(i); // myvector: 1 2 3 4 5 6 7 8 9 int mycount = count_if (myvector.begin(), myvector.end(), IsOdd); std::cout << "myvector contains "<< // Returns count of occurrences of value in. This example shows how to return the number of non-zero values in a vector. So your constraint looks like $$ \| x\|_0 \leq R $$ However, the term norm here is used loosely, since the 0-norm is not really a norm (it does not satisfy triangle inequality).
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