Computing greatest common denominator in python
If you have a list of integers in python, say L = [4,8,12,24], how can you compute their greatest common denominator/divisor (4 in this case)? ...
division
Having trouble with MySQL division query (probably simple fix)
I'm trying to figure out the overall ratio for users. There is basically two columns I need to look at to figure out the ratio, total_emails and total_hours. SELECT sum(total_emails/total_hours) as ratio FROM table WHERE id= 1 LIMIT 0, 1; This appears to adding the ratio up multiple times and I get a number like 8.45 when I should be...
Delphi 6 Compiler Options (Pentium-safe FDIV)
I recieved a crash report from MadExcept from a user. The Exception was Invalid floating point operation. The odd part though is that the callstack dies at @FSafeDivide. I did a google and found out that this was a check for certain pentium chips which didn't do division correctly. If the test failed all the divisions would be done i...
Matlab division... should 29 / 128 return 0?
I really don't think this is a precision problem, the answer is .226-ish... here's the exact code: val = I(i,j) bucketSize pos = val / bucketSize 'I' is just a matrix I'm taking values from. Here is the output from MatLab: val = 29 bucketSize = 128 pos = 0 what am I missing? ...
Python 2.6.5: Divide timedelta with timedelta
Hi, I'm trying to divide one timedelta object with another to calculate a server uptime: >>> import datetime >>> installation_date=datetime.datetime(2010,8,01) >>> down_time=datetime.timedelta(seconds=1400) >>> server_life_period=datetime.datetime.now()-installation_date >>> down_time_percentage=down_time/server_life_period Traceback (...
Strange division problem on mysql
Look at the strange problem on MYSQL. Look at the column 3. The result is 0.02876121 but the actually result should be the column 4 = 0.02876. Why is MYSQL giving fault value on decimal points? *Another thing is that, it only give wrong value if I append "Where column = 'uniquevalue'" to return the result i want. The value is correct ...
noob: Why divide always produces 0.0 float/integer problem?
Hello helpers! So if I have a range of numbers '0 - 1024' and I want to bring them into '0 - 255', the maths would dictate to divide the input by the maximum the input will be (1024 in this case) which will give me a number between 0.0 - 1.0. then multiply that by the destination range, (255). Which is what I want to do! But for some ...
Division by Zero Errors
Mann i have a problem with this question from my professor. Here is the question: Write the definition of a function typing_speed , that receives two parameters. The first is the number of words that a person has typed (an int greater than or equal to zero) in a particular time interval. The second is the length of the time interval i...
Division by power of 2 with round toward zero
I need to compute a number (a/(2**b) using only bitwise operators such as ! & ^ ~ and shifts. I was given the following hint but I'm new to C and I dont know what the code means: int bias = x>0 ? 0 : ((1<<n)-1); Can anyone explain it to me? I thought a>>b would work but I dont think it works for negative numbers. ...
Python: why does this division is not performed correctly ?
I've a strange issue in python, the division is not performed correctly: print pointB[1] print pointA[1] print pointB[0] print pointA[0] print (pointB[1]-pointA[1]) / (pointB[0]-pointA[0]) These are the results: 100 50 100 40 0 thanks ...
How do I divide the rows of a matrix by different values in MATLAB (array division)
Lets said I have the matrix M = ones(3); and I want to divide each row by a different number, e.g., C = [1;2;3];. 1 1 1 -divide_by-> 1 1 1 1 1 1 1 -divide_by-> 2 = 0.5 0.5 0.5 1 1 1 -divide_by-> 3 0.3 0.3 0.3 How can I do this without using loops? ...
Testing divisibility of Ints by 11
I'm struggling with this code right now. I want to determine whether an integer is divsible by 11. From what I have read, an integer is divisible to 11 when the sum (one time +, one time -) of its digits is divisible by 11. For example: 56518 is divisible by 11, because 8-1+5-6+5 = 11, and 11 is divisible by 11. How can i write this ...
How can I strength reduce division by 2^n + 1?
I need to perform some integer divisions in the hot path of my code. I've already determined via profiling and cycle counting that the integer divisions are costing me. I'm hoping there's something I can do to strength reduce the divisions into something cheaper. In this path, I am dividing by 2^n+1, where n is variable. Essentially I w...