mathematical-expressions

I want with a given double number to return its "size" (known as |number|, or number of digit without the numbers after the dot), for example: 12.324654 -> 2 12 -> 2 0.99 -> 0 1.01 -> 1 901 -> 3 -0.99 -> 0 -9.999 -> 1 There must be a function is .net that I dont familiar with that does it.. Thanks. ((int)Math.Abs(12.324654)).ToString().Length Math.Abs will convert to positive number (don't want to count the negative sign) (int) will drop the digits following the decimal point ToString() converts to a string ===> "12" Length tells you how many characters there are there is an edge case where

Within the R Neural Network page, I am using the neural network function to attempt to predict stock price. Training data contains columns High,Low,Open,Close. myformula <- close ~ High+Low+Open neuralnet(myformula,data=train_,hidden=c(5,3),linear.output=T) My question, Given the below data example could you tell me what the formula would look like. I have a table with columns "High","Low","Open","Close" it has two rows of values, each row represents a candle stick for the day. So the two rows in the data are candle sticks for the previous two days.My aim is tp predict what the next candle

I'm trying to insert a variable mathematical operator into a if statement, an example of what I'm trying to achieve in parsing user-supplied mathematical expressions: maths_operator = "==" if "test" maths_operator "test": print "match found" maths_operator = "!=" if "test" maths_operator "test": print "match found" else: print "match not found" obviously the above fails with SyntaxError: invalid syntax . I've tried using exec and eval but neither work in an if statement, what options do I have to get around this? Use the operator package together with a dictionary to look up the operators

I want to tokenize a given mathematical expression into a parse tree like this: ((3 + 4 - 1) * 5 + 6 * -7) / 2 '/' / \ + 2 / \ * * / \ / \ - 5 6 -7 / \ + 1 / \ 3 4 Is there any pure Python way to do this? Like passing as a string to Python and then get back as a tree like mentioned above. Thanks. Yes, the Python ast module provides facilities to do this. You'll have to look up the exact interface for your version of Python, since the ast module seems to change regularly. In particular, the ast.parse() method will be helpful for your application: >>> import ast >>> ast.parse("(1+2)*3", "",