I am trying to sort the following data in the Matlab, but not getting the expected output what I need.
Here is data:
'1B-3A-5A'
'1A-3A-19A'
'2A-2A-4A-5A'
'2B-2A-5A'
'2A-4A-5A'
'2C-5A-30A'
'11A-3A-19A
'3A-19A-42C'
'4A-4A-12A'
'19A-21A-42C'
'25A-41D'
'41C-41C'
'39C-41C'
'43E'
'39A-41D'
'1A-3A-5A-7A'
'7C-27A-28A'
I need the sorted list such that it considers the first number then the alphabet to sort the list like below
'1A-3A-19A'
'1A-3A-5A-7A'
'1B-3A-5A'
'2A-2A-4A-5A'
'2A-4A-5A'
'2B-2A-5A'
'2C-5A-30A'
'3A-19A-42C'
'4A-4A-12A'
'7C-27A-28A'
'11A-3A-19A
'19A-21A-42C'
'25A-41D'
'39A-41D'
'39C-41C'
'41C-41C'
'43E'
Can you please suggest a way to do it? I tried all ways but it doesn't sort it like I want. Thanks!!
How about using sort or sortrows? This does actually sort strings as well:
If A is a string, then sort(A) sorts according to the ASCII dictionary order. The sort is case sensitive with uppercase letters appearing in the output before the lowercase letters.
As #StewieGriffin pointed out, this sorts 11a before 1a. Conveniently Douglas Schwarz has already produced a code that overcomes exactly this problem of alphanumeric sorting on numerics first and characters after.
Related
This:
(sort '("Aaa" "Ééé" "Zzz") #'string-lessp)
;; ("Aaa" "Zzz" "Ééé")
is not satisfying, because "Ééé" should come before "Zzz".
How can we sort unicode strings alphabetically?
My current approach has been to create a copy of the strings, replace accentuated letters by their counterpart (with cl-slug:asciify, that calls ppcre:regexp-replace-all), sort this and display the original string back.
Thanks.
If you use SBCL, you have integrated support for unicode.
String operations
Try to sort with unicode< instead of string-lessp.
I have input with floats stored like 1000,50, ie. the decimal points are replaced by commas.
Is there an option in K to load these numbers directly into floats ?
When using
data:("SFF" ;";",";") 0:. filename
I get 0ns, of course, because the numbers are not recognized as floats.
I load them as strings now, and convert them using ssr like
c:.:' .q.ssr'[data;",";"."]
but that is extremely slow.
Is there an option somewhere to have K load these numbers in CCC,CC format as floats directly ? Normal format and ccc,cc format are not mixed, any file has just one of them.
If there is not, I imagine that it must by quite easy to replace a "." somewhere in the Q-binary where the load-function sits, with a ",", to get a version which loads these numbers. Has anybody tried that ? Or any other tip to load big files with these numbers in reasonable time ?
Cheers,
Co
If ssr' is slow for your task you may find this tiny function useful:
c2p:{c:-1_sums count each x;p:ss[r:raze x;","];r[p]:".";(0,c) _ r}
Update: an alternative version:
c2p:{p:ss[r:raze x;","];r[p]:".";(0,-1_sums count'[x])_r}
It concatenates all strings into a single long string, finds positions of commas, replaces commas with periods then splits that long string:
q)N:1000000
q)s:string[N?100000],'",",'string N?1000
q)\t r1:ssr'[s;",";"."]
4284
q)\t r2:c2p s
242
q)r1~r2
1b
I was thinking something like find (?) combined with indexing/applying
q)N:1000000
q)s:string[N?100000],'",",'string N?1000
q)\ts {s[x;y]:"."}./:flip(til count s;s?\:",")
967 52972144
q)s
"93912.794"
"57144.788"
"77809.659"
"7839.47"
"6363.523"
"44761.244"
"65699.712"
It's not perfect but that's the general idea. I'm sure there is an easier way...
I have a data structure which has data points named Vel1 to Vel1520. However, when I apply Uorder = orderfields(MeanU_Velocity); the variables put in the order Vel1 Vel10 Vel100 Vel1000 Vel1001 Vel1002 etc. Is there any way to sort the data structure such that it lists the variables from 1 to 1520 in ascending order? Regards, Jer
An easy fix to this is to always use the same number of digits. 0001, 0002, ..., 0010, ..., 1520
instead of num2str(42), try sprintf('Vel%04d', 42). This prints formatted text to a string. %04d is a special code that says: fill with zeros, reserve 4 places, print an integer number. Have a look at the documentation and look at matlabs formatted strings tutorial for more comprehensive examples.
As the title suggests I'm looking to detect where the numbers are in a string and then to just take the substring from the larger string. EG
If I have say zero89 or eight78, I would just like zero or nine returned. When using the strsplit function I have:
strsplit('zero89', but what do I put here?)
Interested in regexp that will provide you more options to explore with?
Extract numeric digits -
regexp('zero89','\d','match')
Extract anything other than digits -
regexp('zero89','\d+','Split')
strsplit('zero89', '\d', 'DelimiterType', 'RegularExpression')
Or just using regexp:
regexp('zero89','\D+','match')
I got the \D+ from here
Assuming you mean this strsplit?
strsplit('zero89', '8')
I want NSLogto output a literal escape sequence, without treating it as a pattern.
Take, for example NSLog(#"image%03d.jpg");, who's output I want to be the actual contents, image%03d.jpg instead of image000.jpg.
I've tried various escape sequences like NSLog(#"image\\%03d.jpg");, NSLog(#"image\\%03\\d.jpg"); and NSLog(#"image%03\\d.jpg");, none of which yielded the expected results.
The problem only grows further when I'm including an actual pattern that I do want to replace, after the literal one: NSLog(#"image\\%03d.jpg test %d", 1);, that I'd like to output image%03d.jpg test 1.
Use two %% characters and you will get the desired results:
NSLog(#"image%%03d.jpg");