I am looking for a way to access a specific column and row from an external file (txt or csv for example. Idealy it would be from an excel sheet.) using fortran.
Example: in my txt file is a matrix:
1 2 3
4 5 6
7 8 9
I only want to access the "6".
I know that there are different access methods.
Is it right that i can't access a specific column and row using the default "sequential access method"?
I know there are two other methods, "direct access" and "stream", but i can't find good documentation online.
Using the direct access method, i don't know the right statements or arguments for the "read" funktion to access a specific entry from a file.
It would be of huge help if somebody could advise a good documentation.
Related
I've set up a Google Sheets workbook that synthesizes data from a few different sources via manual input, IMPORTHTML and IMPORTRANGE. Once the data is populated, I'm using INDEX MATCH to filter and compare the information and to RANK each data set.
Since I have multiple data inputs, I'm running into a persistent issue of names not being written exactly the same between sources, even though they're the same person. First names are the primary culprit (i.e. Mary Lou vs Marylou vs Mary-Lou vs Mary Louise) but some last names with special symbols (umlauts, accents, tildes) are also causing errors. When Sheets can't recognize a match, the INDEX MATCH and RANK functions both break down.
I'm wondering how to better unify the data automatically so my Sheet understands that each occurrence is actually the same person (or "value").
Since you can't edit the results of an IMPORTHTML directly, I've set up "helper columns" and used functions like TRIM and SPLIT to try and fix instances as I go, but it seems like there must be a simpler path.
It feels like IFS could work but I can't figure how to integrate it. Also thinking this may require a script, which I'm just beginning to study.
Here's a simplified example of what I'm trying to achieve and the corresponding errors: Sample Spreadsheet
The first tab is attempting to pull and RANK data from tabs 2 and 3. Sample formulas from the Summary tab, row 3 (Amelia Rose):
Cell B3: =INDEX('Q1 Sales'!B:B, MATCH(A3,'Q1 Sales'!A:A,0))
Cell C3: =RANK(B3,$B$2:B,1)
Cell D3: =INDEX('Q2 Sales'!B:B, MATCH(A3,'Q2 Sales'!A:A,0))
Cell E3: =RANK(D3,$D$2:D,1)
I'd be grateful for any insight on how to best index 'Q2Sales'!B3 as the correct value for 'Summary'!D3. Thanks in advance - the thoughtful answers on Stack Overflow have gotten me this far!
to counter every possible scenario do it like this:
=ARRAYFORMULA(IFERROR(VLOOKUP(LOWER(REGEXREPLACE(A2:A, "-|\s", )),
{REGEXEXTRACT(LOWER(REGEXREPLACE('Q2 Sales'!A2:A, "-|\s", )),
TEXTJOIN("|", 1, LOWER(REGEXREPLACE(A2:A, "-|\s", )))), 'Q2 Sales'!B2:B}, 2, 0)))
Im a noob programmer currently making a small family database using cpp but i have trouble deleting a family from the the list...
My list looks something like this
start-of-family 1
jim
joe
bob
sam
end-of-family 1
start-of-family 2
rob
max
end-of-family 2
start-of-family 3
sue
tom
kim
end-of-family 3
If i wanted to delete family 1, I would locate start-of-family 1 and end-of-family 1. Then run a loop but how do i locate it if the user only inputs an int to represent a family number. Also how do i make the succeeding family numbers deduct by 1 so that family 2 will be 1 and family 3 will be 2.
thanks a lot
If I were doing this problem I would start by making each family into a vector of names. Then, I would create a vector containing those family vectors.
The result would look something like:
{
<(jim), (joe), (bob), (sam) >
<(rob), (max) >
<(sue), (tom), (kim) >
}
Then, if the user wants to delete one of the families, you can use vector.remove(n) where n is the index of the family to be removed.
This sounds like a school or text book assignment. Have you gotten to vectors yet? Where are the names coming from? Are you hard coding them into the list? Or reading them from a .txt file? What kind of list structure are you storing them in right now?
i realized that clearing the db and updating it with what ive got is way easier than modifying the db and updating my program
I have a task to complete.
There are two types of csv files 4000+ both related to each other.
2 types are:
1. Country2.csv
2. Security_Name.csv
Contents of Country2.csv:
Company Name;Security Name;;;;Final NOS;Final FFR
Contents of Security_Name.csv:
Date;Close Price;Volume
There are multiple countries and for each country multiple security files
Now I need to READ them do some CALCULATION and then WRITE the output in another files
READ
Read both the file Country 2.csv and Security.csv and extract all the data from them.
For example :
Read France 2.csv, extract Security_Name, Final NOS, Final FFR
Then Read Security.csv(which matches the Security_Name) and extract Date, Close Price, Volume
Calculation
Calculations are basically finding Median of the values extracted which is quite simple.
For Example:
Monthly Median Traded Values
Daily Traded Value of a Security ... and so on
Write
Based on the month I need to sort the output in two different file with following formats:
If Month % 3 = 0
Save It as MONTH_NAME.csv in following format:
Security name; 12-month indicator; 3-month indicator; FOT
Else
Save It as MONTH_NAME.csv in following format:
Security Name; Monthly Median Traded Value Ratio; Number of days Volume > 0
My question is how do I design my application in such a way that it is maintainable and the flow of data throughout the execution is seamless?
So first thing. Based on the kind of data you are looking to generate, I would probably be looking at moving this data to a SQL db if at all possible. This is "one SQL query" kind of stuff. And far more maintainable than C++ that generates CSV files from CSV files.
Barring that, I would probably look at using datamash and/or perl. On a Windows platform, you could do this through Cygwin or WSL. Probably less maintainable, but so much easier it's not too much of an issue.
That said, if you're looking for something moderately maintainable, C++ could work. The first thing I would do is design my input classes. Data-centric, but it can work. It sounds like you could have a Country class, a Security class, and a SecurityClose class...or something along those lines. You can think about whether a Security class should contain a collection of SecurityClosees (data), or whether the data should just be "loose" and reference the Security it belongs to. Same with the Country->Security relationship.
Once you've decided how all that's going to look, you want something (likely a function) that can tokenize a CSV line. So "1,2,3" gets turned into a vector<string> with the contents "1" "2" "3". Then, each of your input classes should have a constructor or initializer that takes a vector<string> and populates itself. You might need to pass higher level data along too. Like the filename if you want the security data to know which security it belongs to..
That's basically most of the battle there. Once you've pulled your data into sensibly organized classes, the rest should come more easily. And if you run into bumps, hopefully you can ask specific design or implementation questions from there.
This is how the data is stored in the file given. There are 8 attributes given.
I need association rule mining done using Apriori Algorithm in WEKA.
Such as, if item 1 & item 2 are bought --> item 4 is also bought or something reasonable as that.
What I tried:
Converting the file into .arff format and loading into weka.
Turning all attributes in Nominal and running the algorithm Apriori.
But the rules generated are very weird.
This is how the result comes. It has no proper information. No rules like what i want, which actually define what a user will buy with what or anything.
i.e. the rules generated here are of no information to me, there is no relation/rules given as to which item will be bought with what.
How should I preprocess this data to format it well or if am making any other mistake would be really appreciated.
Okay, I know I'm going back a few years, but maybe I'll run across some graybeards (like mine) :).
I have an indexed data file with a key field. It's opened like so in the application:
OPEN (FILE='DATA.MAS',STATUS='OLD',
1 ORGANIZATION='INDEXED',ACCESS='KEYED',
1 RECL=28,UNIT=LUNTM,SHARED,
1 KEY=(1:49:CHARACTER),
1 IOSTAT=IOS,ERR=9999)
I need to be able to scan the content of this file sequentially. However, every combination of organization and access options in the open, followed by reads always results in an error, either on the open or the read. Is it even possible to get the nth record of a keyed file?
Okay, found the solution after reading the doc for the umpteenth time. I changed the OPEN statement for SEQUENTIAL access and INDEXED organization. What I missed was that when you do this, FORTRAN interprets the file as FORMATTED. Adding FORM='UNFOFRMATTED' and adjusting the record size yields happiness and yuletide greetings