scientific-notation

问题 I need to prevent my double to print in scientific notation in my file, when I do this outfile << X; 回答1: To set formatting of floating variables you can use a combination of setprecision(n), showpoint and fixed. In order to use parameterized stream manipulators like setprecision(n) you will have to include the iomanip library: #include <iomanip> setprecision(n) : will constrain the floating-output to n places, and once you set it, it is set until you explicitly unset it for the remainder of

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 5 years ago . I need to read a data file in which numbers are written in a format like this: 1.0d-05 C++ doesn't seem to recognize this type of scientific notation! Any ideas on how I could read/convert those types of numbers? I need numbers (i.e. double / float ) not strings. Maybe there is already a class /

问题 I was using this question to help me create a Scientific Notation function, however instead of 4.08E+10 I wanted this: 4.08 x 10^10 . So I made a working function like so: def SciNotation(num,sig): x='%.2e' %num #<-- Instead of 2, input sig here x= x.split('e') if (x[1])[0] == "-": return x[0]+" x 10^"+ x[1].lstrip('0') else: return x[0]+" x 10^"+ (x[1])[1:].lstrip('0') num = float(raw_input("Enter number: ")) sig = raw_input("Enter significant figures: ") print SciNotation(num,2) This

问题 How do I convert an array like: array([ -9.8737e+13, -9.8737e+13, -1.1265e+14, 1.5743e-01, 1.1265e+14, 9.8737e+13, 9.8737e+13]) into a readable form in numpy or python ? Thanks! Chris 回答1: Your array contains both large and small values. It's hard to present both in a readable way. If you use scientific notation the numbers can be shown in a compact form, but it's hard to tell at a glance which numbers are large and which are small. Alternatively, you could display the floats without

问题 This question is not seeking developer code formatting opinions. Personally, I prefer to use scientific notation in my JS code when I can because I believe it is more readable. For me, 6e8 is more readable than 600000000 . That being said, I am solely looking for potential risks and disadvantages specifying numbers in scientific notation in JS. I don't see it often in the wild and was wondering if there is technical reasoning for that or if it simply because of developer's druthers. 回答1: You

问题 Consider the following script: list_of_numbers <- as.numeric() for(i in 1001999498:1002000501){ list_of_numbers <- c(list_of_numbers, i) } write(list_of_numbers, file = "./list_of_numbers", ncolumns = 1) The file that is produced looks like this: [user@pc ~]$ cat list_of_numbers 1001999498 1001999499 1.002e+09 ... 1.002e+09 1.002e+09 1.002e+09 1002000501 I found a couple more ranges where R does not print consistently the number format. Now I have the following questions: Is this a bug or is

问题 How can i apply mysql MIN() over mixed decimal value and scientific notation values. I need to get minimum distance using latitude longitude equation in a mysql query with MIN(). It is working if the distance are decimal. But it is not working properly, if some distance are too small like "5.89872212195226e-05" The problem is MIN(4,5.89872212195226e-05) in a mysql query will always return '4'. Here is the part of query MIN ( (acos(sin((".$searchLat."*pi()/180)) * sin((b_loc.locLatitude*pi()

问题 I am having to change one of the columns in table which currently is Float to Varchar, but when I use alter command, it stores some of the longer numbers in Scientific Notation. Can I avoid this? If not, is there a way to easily update the table later to store the scientific notation as normal integer? Thanks 回答1: Please check the link convert float into varchar in SQL server without scientific notation You can cast the float to varchar(max) How to convert float to varchar in SQL Server 回答2:

问题 How can get following formatting (input values are always less than 0.1): > formatting(0.09112346) 0.91123E-01 > formatting(0.00112346) 0.11234E-02 and so on. I am looking for some elegant solution. I am already using a custom function given below: def formatting(x, prec=5): tup = x.as_tuple() digits = list(tup.digits[:prec]) dec = ''.join(str(i) for i in digits) exp = x.adjusted() return '0.{dec}E{exp}'.format(dec=dec, exp=exp) 回答1: You can use the format() function. The format specification

问题 The float: fl = 0.000005 casts to String as str(fl)=='5e-06' . however, I want it to cast as str(fl)='0.000005' for exporting to CSV purposes. How do I achieve this? 回答1: Use fl = 0.00005 s = str('%8.5f' % fl) print s, type(s) Gives 0.00005 <type 'str'> In case you want no extra digits, use %g fl = 0.0005 s = str('%g' % fl) print s, type(s) fl = 0.005 s = str('%g' % fl) print s, type(s) Gives 0.0005 <type 'str'> 0.005 <type 'str'> 回答2: You can just use the standard string formatting option