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I have a wavelet function with leading and trailing zeros. I would like to strip all the zeros which occur before or after the wavelet. However, I would not like to remove any zeros within the wavelet itself. To simplify, let's say I have the following 1x11 vector:
0 0 0 -2 -1 0 -1 -2 0 0 0
After removing leading and trailing zeros the vector should be:
-2 -1 0 -1 -2
My actual vectors are large and performance is my primary concern. I am a MATLAB novice and would appreciate any tips on how to accomplish this task as efficiently as possible.
502
Approach: Mark the first non-zero number's index in the given array. Store the numbers from that index to the end in a different array. Print the array once all numbers have been stored in a different container.
Multiply by 1. A better way to remove trailing zeros is to multiply by 1 . This method will remove trailing zeros from the decimal part of the number, accounting for non-zero digits after the decimal point. The only downside is that the result is a numeric value, so it has to be converted back to a string.
Description. newStr = strip( str ) removes all consecutive whitespace characters from the beginning and end of str , and returns the result as newStr . newStr = strip( str , side ) removes all consecutive whitespace characters from the side specified by side . The side argument can be 'left' , 'right' , or 'both' .
Try this
y = x(find(x,1,'first'):find(x,1,'last'));
The find(x,1,'option') command gives you first and last non-zero indices.
154
i1 = find(X, 1, 'first')
will give you the index of the first non-zero element of X
i2 = find(X, 1, 'last')
will give you the index of the last one. Then
X(i1:i2)
will give you the array with the leading and trailing zeros stripped.
20
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