subtraction

问题 I got a small question with a big background. Let me ask a short version and then expand it a little bit. Short version of my question is as follows. Imagine a situation - you have branch A with changelists 1000 to 1004. Then you make branch B from changelist 1004 and add a couple of more revisions (1005, 1006). After that you need to remove delta introduced by changelist 1002 from branch B. How can I do it? If I needed that on branch A - no problem, just Rollback to 1001 and re-integrate

问题 I have two Numpy arrays which look like this: a = [[ [1,2,3], [4,5,6] ], [ [7,8,9], [10,11,12] ]] b = [[ [1,1,1], [0,0,0] ], [ [3,3,3], [4,4,4] ]] I want to perform c = a - b with condition that c = 255 if b>0 else a So c should be like this: c = [[ [255,255,255], [4,5,6] ], [ [255,255,255], [255,255,255] ]] How to do it efficiently without any loop? 回答1: Use np.where >>> c = np.where(np.array(b)>0, 255, a) >>> c array([[[255, 255, 255], [ 4, 5, 6]], [[255, 255, 255], [255, 255, 255]]]) Btw.

问题 I would like to know how to "subtract letters" in C: I mean, I have 2 letters, 'a' and 'c' and i want to execute 'c'-'a'='b' which is 3-1=2. How is it possible to obtain the same behaviour in C? I can conversion Letters->Numbers but how to manage the limited lenght of the alphabet? Thank you. 回答1: you can treat the letters as numbers and then add the letter 'a' back to normalize it so char c1 = 'a'; char c2 = 'c'; int diff = c2 - c1; //'c' - 'a' = 2 char ans = diff + 'a' - 1; //add 'a' and

问题 So As you can see I have a price and Day columns below Price Day 2 1 5 2 8 3 11 4 14 5 17 6 20 7 23 8 26 9 29 10 32 11 35 12 38 13 41 14 44 15 47 16 50 17 53 18 56 19 59 20 I then want the output below Difference Day 12 5 15 10 15 15 15 20 So now I have the difference in prices every 5 days...it just basically subtracts the 5th day with the first day.....and then the 10th day with the 5th day etc.... I already made a code that will seperate my data into 5 day intervals...but I want the code

问题 May be I might be blind or silly, but look at my function: function max_min_twenty($value) { if ((int)$value == 0) { return "0"; } else { $percent_val = ((int)$value / 100) * 20; $maxvalue = (int)$value + $percent_val; $minvalue = (int)$value - $percent_val; $returnvalue = round($minvalue)."-".round($maxvalue); return $returnvalue; } } Seems that this is really easy! It works like it should, but if my $value is 1500000 it gives me back 1,2E+6 for $minvalue - It does well if I choose a

问题 This question already has answers here : Handling large numbers in C++? (9 answers) Closed 6 years ago . I'm relatively new to programming :). Suppose I wanted to create a program which prompts a user to enter two positive numbers up to 50 digits long, which then subtracts the second number from the first number. For example: The user enters the first positive number: 239834095803945862440385983452184985298358 second number: 939542309853120721934217021372984729812 ============================

问题 i'm new to Android and DSP. i'm implementing the Spectral Subtraction algorithm thanks my goal is to use this algorithm over a phone call stream buffer i'm trying to figure how to implement this code from the Matlab implementation of Spectral Subtraction i am using. Matalb code: function Seg=segment(signal,W,SP,Window) % SEGMENT chops a signal to overlapping windowed segments % A= SEGMENT(X,W,SP,WIN) returns a matrix which its columns are segmented % and windowed frames of the input one

问题 I have a small issue performing a subtraction on numbers using prefix and postfix operators. This is my program: public class postfixprefix { public static void main (String args[]) { int a = 5; int b; b = (a++) - (++a); System.out.println("B = " +b); } } Doing this, theoretically I am supposed to get 0 as the answer, but however, I am getting a -2. When I try to individually try to increment the values like in this program: public class postfixprefix { public static void main (String args[])

问题 I have a Database. It contains 2 Tables. Let me call them Table A and Table B. Table A Content: Date Name of Supplier Name of Good Delivered Amount of Good Delivered, simply put Ingrediënt A (Numeric Value) Table B Content: Production Date Name of Product Ingrediënt A What I exactly want is: Query with Table A, Column 4 minus (Subtraction) Table B, Column 3. Extra Notes: I have been asking this question to a friendly programmer. He adviced me to go through the onlince course of w3schools.com

问题 I have a mongo db collection like below, { "id": ObjectId("132456"), reading :[ { "weight" : { "measurement" : 82.0, "unit" : "kg" } } ], "date" : ISODate("2018-09-12T11:45:08.174Z") }, { "id": ObjectId("132457"), reading :[ { "weight" : { "measurement" : 80.0, "unit" : "kg" } } ], "date" : ISODate("2018-09-12T10:45:08.174Z") }, { "id": ObjectId("132458"), reading :[ { "weight" : { "measurement" : 85.0, "unit" : "kg" } } ], "date" : ISODate("2018-09-11T09:45:08.174Z") } I need a mongo db