I am a newbie learning sml and the question I am given involves IO functions that I do not understand.
Here are the 2 questions that I really need help with to get me started, please provide me with code and some explanation, I will be able to use trial and error with the code given for the other questions.
Q2) readlist(filename) which reads a list of filenames (each of which were produced by listdir in (Q1) and combines them into one large list.
(reads from the text file in Q1 and then assigns the contents into 1 big list containing all the information)
Thing is, I only learned from the lecturer in school on the introduction section, there isn't even a system input or output example shown, not even the "use file" function is taught. if anyone that knows sml sees this, please help. Thanks to anyone who took the effort to help me.
Thanks for the reply, current I am using SMLNJ to try and do this. Basically, Q1 requires me to list the directory's files of the "directoryname" provided into a text file in "filename". The Q2 requires me to read from the "filename" text file and then place the contents into one large list.
BTW, if you people only kept seeing this post, please try and ask questions also. Currently i am stuck trying to read from the txt file and appending it to a list, I am able to do it for a single line but am now trying to do it for the whole file:
fun readlist(infile : string) =
let val ins = TextIO.openIn infile
fun listing() =
TextIO.inputLine ins;
in listing()
end;
TextIO.closeIn;
It is very hard for me to make out what questions you are trying to ask.
The functions you ask about are not part of the Standard Basis Library for ML. If you are supposed to write them, you are going to have a hard time without some kind of Posix module. You can tell your instructor I didn't care for this assignment.
Moscow ML contains a listDir function which is admirably simple:
- load "Mosml";
> val it = () : unit
- Mosml.listDir ".";
> val it = ["natural-semantics.djvu", "natural-semantics.pdf"] : string list
-
To get more help, please be a little clearer what you are asking.
EDIT: Since it's a homework question I shouldn't just give you the answer, but some useful functions includeopenDir, readDir, and closeDir from the OS.Filesys structure. These will tell you what's in the directory. Then to read and write files you'll want TextIO.
You'll find the Standard Basis Library documentation indispensible.
You sure i didn't teach u?
u owe me one chicken pie.
Related
I'm trying to read a csv and gather two types of informations.
I need to read it once to get the number of lines that my csv contains.
I need to go back to the top of the csv and re read it again to retrieve the values.
I'm looking for something similar to seek(0) in java for bufferedSource
I've tried to close and re open the buffer but I think I'm overthiking it.
I also read through the source library but nothing came close to what I'm looking for.
PS:I know this is not optimized however my first read will basically enable me to create an array to store the values I'd retrive from the second read(and not a list).
I would take any clue you might have to offer !
Thanks a lot
I am trying to wrap some UniData Subroutines to SOAP Web Service. I'm planning to use C# and UODOTNET library (IBM U2 Data Management Interface for .NET). Also I'm looking to create an engine to read all the available Subroutines from data server and also reads all the required parameters and dynamically generate required codes for Web Service.
My code would be something like this:
var session = UniObjects.OpenSession(
"192.168.0.1",
"user",
"password",
"account"
);
var cmd = session.CreateUniCommand();
cmd.Command = "LIST SUBURB.INDEX"; // ?????
cmd.Execute();
var res = cmd.Response;
Question 1: Is there any command that I can use to retrieve the list of all available subroutines?
Question 2: Is there any command that I can use to retrieve list of all parameters for specific subroutine?
Cheers
The short answer is no.
The longer answer is yes, but with a lot of work.
Since you are asking this question, I'm going to assume you are missing a lot of generally knowledge about the platform. Hence to be able to do this you'll need to:
Learn about how VOC works, specifically how executable code can be catalogued here.
Learn about the CATALOG and how cataloguing programs globally, locally and direct differ.
Understand how your system in particular is designed. Some places have everything directly catalogued in the VOC, others are a mix. If the former, it'll be easier for your question.
Once you understand the above, you'll know how to get a list of all executable programs from VOC, local catalog and global catalog. For example, a simplified example for the VOC is the UniQuery command LIST VOC WITH F1="C".
The hard part is getting the parameter list, of which there isn't any system command. To do this you have 2 options.
Reverse engineer the byte code of every subroutine and tease out the number of parameters
If you have access to the related source code, parse it to generate the list.
Just wanted to add a comment on this one, in UniData there is a MAKE.MAP.FILE command that will identify Programs and Subroutines ( and the number of parameters) which puts the information in the '_MAP_' file. This does not tell you what the parameters are used for, but it helps.
I was wondering if anyone knew if it is possible to have MATLAB type a string for you, as if the user had typed it on the keyboard. I believe it can be done using a shell script or an applescript, but I was wondering if Matlab had a native implementation.
I have tried searching around for it, but have not had any luck. It is not super necessary, but I am just super lazy and want to write a script that will automatically enter information into an application after MATLAB has calculated stuff.
If you know of another simple way of doing this, let me know as well. Thanks a lot!
EDIT:
Adding some code that I used in response to an answer below, using the Java Robot Class
function robotType(text)
import java.awt.Robot;
import java.awt.event.*;
SimKey=Robot;
for i = 1:length(text)
if strcmp(text(i),upper(text(i))) == 0 || all(ismember(text(i),'0123456789')) == 1
eval(['SimKey.keyPress(KeyEvent.VK_',upper(text(i)),')'])
eval(['SimKey.keyRelease(KeyEvent.VK_',upper(text(i)),')'])
else
SimKey.keyPress(KeyEvent.VK_SHIFT);
eval(['SimKey.keyPress(KeyEvent.VK_',upper(text(i)),')'])
eval(['SimKey.keyRelease(KeyEvent.VK_',upper(text(i)),')'])
SimKey.keyRelease(KeyEvent.VK_SHIFT);
end
end
end
Warning, code may not be the best, but hey it was written in like 5 minutes.
I ended up writing an applescript to do everything that I needed Matlab to do. Unfortunately this will not help the Windows people, but myself and the other people using the script are mac users, so it works for us.
I have however, edited my question above to include code that I used initially in Matlab to auto type things. Simply run command as robotType('SomeString') and it will type that string.
I do not believe it will hand spaces or random characters that well, or at all, but it is good enough for abc123. Sorry for no final solution on this.
I need to load experimental data into scicoslab, a (pretty badly designed) clone fork of scilab which happens to support graphical modeling. The documentation on the web is pretty poor, but it's reasonably similar to scilab and octave.
The data I need to process is contained into a certain number of text files: Data_005, Data_010, …, Data_100. Each of them can be loaded using the -ascii flag for the loadmatfile command.
The problem comes from the fact that loadmatfile("foo", "-ascii") loads the file foo.mat into a variable named foo. In order to to cycle on the data files, I would need to do something like:
for i = [5:5:100]
name = sprintf("Data_%02d", i);
loadmatfile(name, "-ascii");
x = read_var_from_name(name);
do_something(x);
end
where what I search for is a builtin read_var_from_name which would allow me to access the internal symbol table by string.
Do you know if there exist a similar function?
Notes:
There's no way of overriding this behavior if your file is in ascii format;
In this phase I could also use octave (no graphical modelling is involved), although it behaves in the same way.
>> foo = 3.14; name = 'foo'; eval(name)
foo =
3.1400
The above works in MATLAB, and Scilab's documentation says it also has an eval function. Not sure if I understood you correctly, though.
#arne.b has a good answer.
In your case you can also do that in matlab:
a=load('filename.mat')
x=a.('variable_name')
lets go through your points one by one:
"ScicosLab, a (pretty badly designed) clone of Scilab" This in my opinion is an inaccurate way of introducing the software. ScicosLab is not a clone of Scilab but a fork of it. The team behind ScicosLab (INRIA) are the ones who made scocos (now called xcos in Scilab development line). At some point (from Scilab v4) the Scilab team decided to move away from Tcl/tk towards Java, but the SciccosLab/scicos team departed, keep using the language (Tcl) and it's graphical user interface design package (tk). Giving the ScocosLab community the credit that the whole Scilab documentation and support is not very good in general. :) (more about Scilab and the forks here)
Regarding the technical question I'm not sure what you are trying to achieve here, Scilab/ScicosLab still have the eval function which basically does what you want. However this function is to be deprecated in favor of evstr. There is also the execstr function which worth studying.
The loadmatfile, as far as I have understood, "tries" to load the variables defined in a MATLAB .mat file (MATLAB's proprietary tabular format) into the Scilab workspace. For example if there is a variable foo it will "try" to create the variable foo and loads its value from the MATLAB script. Check this example. I would create a variable x(i) = foo in the for loop. again your question is not completely clear.
As a side note maybe you could consider exporting your data as CSV instead of .mat files.
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Closed 12 years ago.
Possible Duplicate:
In Perl, how can I check from which module a given function was imported?
Hi guys!
I am using my weekend time to comb through our web app to get a better understanding of it. It uses numerous modules whose functions get pulled into it and my question is this.. how can I determine the module where a function originates?
Reason I ask is because I am using print STDERR lines sprinkled here and there to understand the way data moves around (it has demystified things greatly).. here's an example....
($file_data,$count) = lookup_files($customer,$site,'','0',$d);
What I'm not sure of is where lookup_files() is originating from. What I'd like to see is this....
($file_data,$count) = lookup_files($customer,$site,'','0',$d);
print STDERR "lookup_files originates here " . <CODE TO SHOW ME WHERE lookup_files IS DEFINED>;
Any advice on where to begin would be greatly appreciated. The webapp uses tons of use modules and instead of selectively importing only what's needed, each use seems to bring all functions in.
I know my terminology might be incorrect when referring to "method", "parent" and so on in regards to Perl. If anyone would like to correct me on it that would be appreciated too. I am at best a beginner with this stuff. Janie
Take a look at the core module Devel::Peek
http://perldoc.perl.org/Devel/Peek.html#A-reference-to-a-subroutine
The output of that module's functions will tell you where a subroutine comes from
One fairly easy way is to load Carp::Always. If it’s a web app, you’ll need to put it in the code. For a command line you can just perl -MCarp::Always ...