I'm confused as the what this write specification is trying to specify. N is an array of single characters. Could someone help me and explain the write format specification below. I saw someone post the exact same question a few days ago but the page is not there anymore.
WRITE(*,'(AA$)') N(I),","
The dollar sign in a format specifier suppresses a new line.
Therefore, the array N is written element-wise as a string (A) separated by a comma (second string A) one a single line.
Note that this syntax is not standard conforming, in modern Fortran you would write the format as
WRITE(*,'(2A)', advance='no') N(I),","
Related
I have some complicated array of structures and I want to write it into CSV file. So I need "variable to string" conversion.
Beckhoff as always doesn't care about documentation and their INT_TO_STRING function doesn't work (UNEXPECTED INT_TO_STRING TOKEN when I try to write INT_TO_STRING(20) ).
Moreover their string functions works correctly with only 255 chars.
So I need one of following:
working functions or function blocks or library which allows to convert different types to string
something like sprintf without limitations
some functions to convert between number and ascii char (0x55 is letter 'U') in both directions.
btw. Beckhoff gives us some weird CSV example code, but without data conversion (array has already strings in cells).
Thanks in advance!
I tried to use:
INT_TO_STRING() BYTE_TO_STRING() WHATEVER_TO_STRING()
but it is not working. And there is no clue how many arguments it should have or anything. There is no documentation in Beckhoff information System.
This question already has an answer here:
How to match a sentence in Lua
(1 answer)
Closed 1 year ago.
Been stuck on this for over a day.
I'm trying to use gsub to extract a portion of an input string. The exact pattern of the input varies in different cases, so I'm trying to use a variable to represent that pattern, so that the same routine - which is otherwise identical - can be used in all cases, rather than separately coding each.
So, I have something along the lines of:
newstring , n = oldstring:gsub(matchstring[i],"%1");
where matchstring[] is an indexed table of the different possible pattern matches, set up so that "%1" will match the target sequence in each matchstring[].
For instance, matchstring[1] might be
"\[User\] <code:%w*>([^<]*)<\\code>.*" -- extract user name from within the <code>...<\code>
while matchstring[2] could be
"\[World\] (%w)* .*" -- extract user name as first word after prefix '[World] '
and matchstring[3] could be
"<code:%w*>([^<]*)<\\code>.*" -- extract username from within <code>...<\code> at start
This does not work.
Yet when, debugging one of the cases, I replace matchstring[i] with the exact same string -- only now passed as a string literal rather than saved in a variable -- it works.
So.. I'm guessing there must be some 'processing' of the string - stripping out special characters or something - when it's sent as a variable rather than a string literal ... but for the life of me I can't figure out how to adjust the matchstring[] entries to compensate!
Help much appreciated...
FACEPALM
Thankyou, Piglet, you got me on the right track.
Given how this particular platform processes & passes strings, anything within <...> needed the escape character \ for downstream use, but of course - duh - for the lua gsub's processing itself it needed the standard %
much obliged
i just have a quick question on this bit of code i have here on the Cryptopals Challenges, using Python3, For XORing a string with one single character.The program takes in a hex string string, decodes it, XORs it with a single character, does this for every possible character, then finds the "most english" line of XORd data. heres my code snippet (which i admittdly used from a solutions page ) :
def singlechar_xor(input_bytes, key_value):
"""XORs every byte of the input with the given key_value and returns the result."""
output = b''
for char in input_bytes:
output += bytes([char ^ key_value])
return output
i know what is happening and i understand what is supposed to happen, im just not sure how bytes behave and what types are and arent supposed to be XORd. Why do i need the brackets around char^key_value? If i remove the brackets my output becomes a bunch of 0's. What is the result of the XOR or the character and the key_value? If someone could kindly explain so i could have a better understanding going forward in these challenges id GREATLY appreciate it <3
I am reading a text file with my fortran code. I parse the text file (which contain a bunch of stuff such as names and numbers) and I end up with strings containing real number (they are real time measuraments) such as:
string = 1.34
I simply write this string in a real number by doing
read(levelCHAR,'(f)') level
And everything worked great for a month until today, when the number in the input file was exactly 1 and I had:
string = 1
and the read statement above gave me
level=0
Therefore to fix this I added before the read statement:
if (index(string ,'.')<=0) then
string = trim(string )//'.'
endif
And this seems to have fixed the issue. However, I wanted to know if I am missing something and there is a more elegant way to do this in one line for example by replacing the format '(f)' in the read statement with a more suitable expression.
Your program is not valid Fortran:
read(levelCHAR,'(f)') level
1
Error: Nonnegative width required in format string at (1)
form.f90:5.5:
You must indicate the input field with such as f5.0. Or you can use the list-directed input read(levelChar,*) level.
Also, be sure to use the .0 and not any other number in the fw.d descriptor for input. Otherwise strange results are to be expected for integer inputs as they will be multiplied by 10**(-d).
I have to write a MATLAB function with the following description:
function counts = letterStatistics(filename, allowedChar, N)
This function is supposed to open a text file specified by filename and read its entire contents. The contents will be parsed such that any character that isn’t in allowedChar is removed. Finally it will return a count of all N-symbol combinations in the parsed text. This function should be stored in a file name “letterStatistics.m” and I made a list of some commands and things of how the function should be organized according to my professors' lecture notes:
Begin the function by setting the default value of N to 1 in case:
a. The user specifies a 0 or negative value of N.
b. The user doesn’t pass the argument N into the function, i.e., counts = letterStatistics(filename, allowedChar)
Using the fopen function, open the file filename for reading in text mode.
Using the function fscanf, read in all the contents of the opened file into a string variable.
I know there exists a MATLAB function to turn all letters in a string to lower case. Since my analysis will disregard case, I have to use this function on the string of text.
Parse this string variable as follows (use logical indexing or regular expressions – do not use for loops):
a. We want to remove all newline characters without this occurring:
e.g.
In my younger and more vulnerable years my father gave me some advice that I've been turning over in my mind ever since.
In my younger and more vulnerableyears my father gave me some advicethat I’ve been turning over in my mindever since.
Replace all newline characters (special character \n) with a single space: ' '.
b. We will treat hyphenated words as two separate words, hence do the same for hyphens '-'.
c. Remove any character that is not in allowedChar. Hint: use regexprep with an empty string '' as an argument for replace.
d. Any sequence of two or more blank spaces should be replaced by a single blank space.
Use the provided permsRep function, to create a matrix of all possible N-symbol combinations of the symbols in allowedChar.
Using the strfind function, count all the N-symbol combinations in the parsed text into an array counts. Do not loop through each character in your parsed text as you would in a C program.
Close the opened file using fclose.
HERE IS MY QUESTION: so as you can see i have made this list of what the function is, what it should do, and using which commands (fclose etc.). the trouble is that I'm aware that closing the file involves use of 'fclose' but other than that I'm not sure how to execute #8. Same goes for the whole function creation. I have a vague idea of how to create a function using what commands but I'm unable to produce the actual code.. how should I begin? Any guidance/hints would seriously be appreciated because I'm having programmers' block and am unable to start!
I think that you are new to matlab, so the documentation may be complicated. The root of the problem is the basic understanding of file I/O (input/output) I guess. So the thing is that when you open the file using fopen, matlab returns a pointer to that file, which is generally called a file ID. When you call fclose you want matlab to understand that you want to close that file. So what you have to do is to use fclose with the correct file ID.
fid = open('test.txt');
fprintf(fid,'This is a test.\n');
fclose(fid);
fid = 0; % Optional, this will make it clear that the file is not open,
% but it is not necessary since matlab will send a not open message anyway
Regarding the function creation the syntax is something like this:
function out = myFcn(x,y)
z = x*y;
fprintf('z=%.0f\n',z); % Print value of z in the command window
out = z>0;
This is a function that checks if two numbers are positive and returns true they are. If not it returns false. This may not be the best way to do this test, but it works as example I guess.
Please comment if this is not what you want to know.