How to subtract data in different rows
Hi I have a file that has a single column of numbers. I have to subtract value in row1 from value in row2, row3-row2; row4-row3 , row5-row4 and so on for all the rows . Could anybody help me out with this ? ...
subtraction
how to subtract circle from an arbitrary polygon
Given an arbitary polygon with vertices stored in either clockwise/counterclockwise fashion (depicted as a black rectangle in the diagram), I need to be able to subtract an arbitrary number of circles (in red on the diagram) from that polygon. Removing a circle could possibly split the polygon into two seperate polygons (as depicted by t...
Storing and retrieving a date in PHP?
This is what I need to do: I need to perform a PHP operation, then retrieve how long ago the last time the operation was performed was. I have it all figured out, except one thing - how do I find the difference between two date/times? Or, is there an easier way to do this? (This is based in Wordpress, so I'm using wp_options to store the...
how to subtract a constant number from a column
Is there a another way to subtract the smallest value from all the values of a column, effectively offset the values? I have to subtract the first number in teh 1st column from all other numbers in teh first column.. I wrote this script which is not giving the right result . can anybody help me ? awk '{$1 = $1 - 1280449530}' file ...
Java regex predefined character class nested inside character class
Hello, I need to use a regular expression that contains all the \b characters except the dot, . Something like [\b&&[^.]] For example, in the following test string: "somewhere deep down in some org.argouml.swingext classes and" I want org.argouml.swingext string to match but org.argouml string not too match. (Using the Matcher.find(...
Please help me....I want to know how to code for background subtraction.
I'm just getting started with OpenCV. I came across this question, and I'm trying to find where that code came from. Any ideas? ...
why is python inconsistent when interpreting a subtraction when making a list?
I am making a small program and at some point from each row of a matrix I need to subtract the average of the row itself. Quite a standard renormalization procedure. Note in the code def subtractaverage(data): datanormalized=[] for row in data: average_row=sum(row)/len(row) print "average=",average_row # r...
Template matching - Image subtraction
I have a project where I am required to subtract an empty template image from an incoming user filled image. The document type is a normal Bank cheque. The aim is to extract the handwritten fields from it by subtracting one image from the empty template image. The issue what i am facing is in aligning these two images, as there is sca...
Bounding box boolean subtraction?
What's the best or an efficient method for subtracting a bounding box from another bounding box (I.e. Creating n bounding boxes from a bounding box Boolean subtraction)? Ideally the resulting bounding boxes are as square as possible so that there are limited 'shard' (I.e. 1width, 1height, 100depth). ...