I created a GUI and used uiimport to import a dataset into matlab workspace, I would like to pass this imported data to another function in matlab...How do I pass this imported dataset into another function....I tried doing diz...but it couldnt pick diz....it doesnt pick the data on the matlab workspace....any ideas??
[file_input, pathname] = uigetfile( ...
{'*.txt', 'Text (*.txt)'; ...
'*.xls', 'Excel (*.xls)'; ...
'*.*', 'All Files (*.*)'}, ...
'Select files');
uiimport(file_input);
M = dlmread(file_input);
X = freed(M);
I think that you need to assign the result of this statement:
uiimport(file_input);
to a variable, like this
dataset = uiimport(file_input);
and then pass that to your next function:
M = dlmread(dataset);
This is a very basic feature of Matlab, which suggests to me that you would find it valuable to read some of the on-line help and some of the documentation for Matlab. When you've done that you'll probably find neater and quicker ways of doing this.
EDIT: Well, #Tim, if all else fails RTFM. So I did, and my previous answer is incorrect. What you need to pass to dlmread is the name of the file to read. So, you either use uiimport or dlmread to read the file, but not both. Which one you use depends on what you are trying to do and on the format of the input file. So, go RTFM and I'll do the same. If you are still having trouble, update your question and provide details of the contents of the file.
In your script you have three ways to read the file. Choose one on them depending on your file format. But first I would combine file name with the path:
file_input = fullfile(pathname,file_input);
I wouldn't use UIIMPORT in a script, since user can change way to read the data, and variable name depends on file name and user.
With DLMREAD you can only read numerical data from the file. You can also skip some number of rows or columns with
M = dlmread(file_input,'\t',1,1);
skipping the first row and one column on the left.
Or you can define a range in kind of Excel style. See the DLMREAD documentation for more details.
The filename you pass to DLMREAD must be a string. Don't pass a file handle or any data. You will get "Filename must be a string", if it's not a string. Easy.
FREAD reads data from a binary file. See the documentation if you really have to do it.
There are many other functions to read the data from file. If you still have problems, show us an example of your file format, so we can suggest the best way to read it.
Related
I want to download multiple xml files from web service API. I have a query that gets a JSON document:
= Json.Document(Web.Contents("http://reports.sem-o.com/api/v1/documents/static-reports?DPuG_ID=BM-086&page_size=100"))
and manipulates it to get list of file names such as: PUB_DailyMeterDataD1_201812041627.xml in a column on an excel spreadsheet.
I hoped to get a function to run against this list of names to get all the data, so first I worked on one file: PUB_DailyMeterDataD1_201812041627
= Xml.Tables(Web.Contents("https://reports.sem-o.com/documents/PUB_DailyMeterDataD1_201812041627.xml"))
This gets an xml table which I manipulate to get the data I want (the half hourly metered MWh for generator GU_401970
Now I want to change the query into a function to automate the process across all xml files avaiable from the service. The function requires a variable to be substituted for the filename. I try this as preparation for the function:
let
Filename="PUB_DailyMeterDataD1_201812041627.xml",
Source = (Web.Contents("https://reports.sem-o.com/documents/Filename")),
(followed by the manipulating Mcode)
This doesnt work.
then this:
let
Filename="PUB_DailyMeterDataD1_201812041627.xml",
Source = Xml.Tables(Web.Contents("https://reports.sem-o.com/documents/[Filename]")),
I get:
DataFormat.Error: Xml processing failed. Either the input is invalid or it isn't supported. (Internal error: Data at the root level is invalid. Line 1, position 1.)
Details:
Binary
So stuck here. Can you help.
thanks
Conor
You append strings with the "&" symbol in Power Query. [Somename] is the format for referencing a field within a table, a normal variable is just referenced with it's name. So in your example
let Filename="PUB_DailyMeterDataD1_201812041627.xml",
Source = Xml.Tables(Web.Contents("https://reports.sem-o.com/documents/" & Filename)),
Would work.
It sounds like you have an existing query that drills down to a list of filenames and you are trying to use that to import them from the url though, so assuming that the column you have gotten the filenames from is called "Filename" then you could add a custom column with this in it
Xml.Tables(Web.Contents("https://reports.sem-o.com/documents/" & [Filename]))
And it will load the table onto the row of each of the filenames.
I have a program which is counting the biggest number from 3 numbers. I need to modify the program as the result to be write in text file maxim.out (PASCAL)
You can write the value (assuming it is an integer and it has the name, say, yourValue) with:
var
maximFile: Text;
...
Assign(maximFile, 'maxim.out'); // link the name to the Text variable
Rewrite(maximFile); // open it for writing
Writeln(maximFile, yourValue); // write the value as a line of its own
Close(maximFile); // close the file
You can then read back the value later on with:
Assign(maximFile, 'maxim.out');
Reset(maximFile);
Readln(maximFile, yourValue);
Close(maximFile);
I did not add any error handling (e.g. if the file can't be found, or if it is readonly, or empty, or ...). Depending on settings, that is either done with exceptions or with IOResult values. Read the documentation on how to do that. There should be examples in the docs.
You should read about "file management in pascal". Anyway, declare a variable of type textfile:
var
outputfile : TextFile;
then assignfile() to it your name of choice (maxim.out), rewrite() the file, use writeln() to write into it, and finally closefile() it.
You can find a complete example program here: http://wiki.freepascal.org/File_Handling_In_Pascal
My problem is the same as the one mentioned in this answer. I've been trying to understand the code and this is what I learned:
It is failing in the file parse_xml.cgi, tries to get messages (return $message{$name}) from a file named messages (located in the html_en directory).
The $messages value comes from the method GetMessageHash in file adminprotocol-lib.pl:
sub GetMessageHash
{
return $ENV{"QTSSADMINSERVER_EN_MESSAGEHASH"}
}
The $ENV{"QTSSADMINSERVER_EN_MESSAGEHASH"} is set in the file streamingadminserver.pl:
$ENV{"QTSSADMINSERVER_EN_MESSAGEHASH"} = $messages{"en"}
I dont know anything about Perl so I have no idea of what the problem can be, for what I saw $messages{"en"} has the correct value (if I do print($messages{"en"}{'SunStr'} I get the value "Sun")).
However, if I try to do print($ENV{"QTSSADMINSERVER_EN_MESSAGEHASH"}{'SunStr'} I get nothing. Seems like $ENV{"QTSSADMINSERVER_EN_MESSAGEHASH"} is not set
I tried this simple example and it worked fine:
$ENV{"HELLO"} = "hello";
print($ENV{"HELLO"});
and it works fine, prints "hello".
Any idea of what the problem can be?
Looks like $messages{"en"} is a HashRef: A pointer to some memory address holding a key-value-store. You could even print the associated memory address:
perl -le 'my $hashref = {}; print $hashref;'
HASH(0x1548e78)
0x1548e78 is the address, but it's only valid within the same running process. Re-run the sample command and you'll get different addresses each time.
HASH(0x1548e78) is also just a human-readable representation of the real stored value. Setting $hashref2="HASH(0x1548e78)"; won't create a real reference, just a copy of the human-readable string.
You could easily proof this theory using print $ENV{"QTSSADMINSERVER_EN_MESSAGEHASH"} in both script.
Data::Dumper is typically used to show the contents of the referenced hash (memory location):
use Data::Dumper;
print Dumper($messages{"en"});
# or
print Dumper($ENV{"QTSSADMINSERVER_EN_MESSAGEHASH"});
This will also show if the pointer/reference could be dereferenced in both scripts.
The solution for your problem is probably passing the value instead of the HashRef:
$ENV{"QTSSADMINSERVER_EN_SUN"} = $messages{"en"}->{SunStr};
Best Practice is using a -> between both keys. The " or ' quotes for the key also optional if the key is a plain word.
But passing everything through environment variables feels wrong. They might not be able to hold references on OSX (I don't know). You might want to extract the string storage to a include file and load it via require.
See http://www.perlmaven.com/ or http://learn.perl.org for more about Perl.
fix code:
$$ENV{"QTSSADMINSERVER_EN_MESSAGEHASH"} = $messages{"en"};
sub GetMessageHash
{
return $$ENV{"QTSSADMINSERVER_EN_MESSAGEHASH"};
}
ref:
https://github.com/guangbin79/dss6.0.3-linux-patch
I often have a task a bit like this: insert a large number of users onto to the users table with similar properties. Not always that simple, but in general, list of strings -> list of corresponding sql statements.
my usual solution is this with the list of usernames in excel use a formula to generate a load of insert statements
=concatenate("insert into users values(username .......'",A1,"'.....
and then I fill down the formula to get all the insert rows.
This works but sometimes the statement is long, sometimes including a few different steps for each, and cramming it all into an excel formula and getting all the wrapping quotes right is a pain.
I'm wondering if there is a better way. What I really want is to be able to have a template file template txt:
insert into users
([username],
[company] ...
)
values('<template tag1>...
and then using some magic command line tool, to simply be able to type something like
command_line> make_big_file_using_template template.txt /values [username1 username2]
/output: bigfile.txt
and this gives me a big file with the template repeated for each username value with the tag replaced with the username.
So does such a command exist, or are my expectations of command line tools too high? Any freely available windows tool will do. I could whip up a c# program to do this in not too much time but I feel like there must be an easy to use tool out there already.
This is trivial using a Powershell script. PS allows inline variables in strings, so you could do something like:
$Tag1 = 'blah'
$Tag2 = 'foo'
$SQLHS = #"
INSERT INTO users
([username],
[company],...)
VALUES
('$tag1', '$tag2'...)
"#
set-content 'C:\Mynewfile.txt' -value $SQLHS
The #"...."# is a here-string, which makes it very easy to write readable code without escaping quotes and such.
The above could be very easily modified to accept parameters for the various tags and another for the output file, or to run for a set of values located in another .txt or .csv file as inputs.
EDIT:
To modify it to accept parameters, you can just add a param() block at top:
param($outfile, $tab1, $tab2, $tab3)
Then use those $variables in your script:
set-content "$outfile" -value $SQLHS
i am new to matlab. While working through the Matlab GUI, i faced a problem which is as follows..i want to have 2 figure files, with one figure file calling the other. i know that just by calling the name of the 2nd fig file from the first fig file, we can call the 2nd figure. however, i also wish to send some parameters from one fig file to another.here i need to send the arguments and also obtain these parameters so as to do further processing.i havent been able to find a solution to this problem. i would be glad if someone helps me out with this problem. thanking you in advance
There are three ways I found to do this:
Method 1: Use setappdata and getappdata like so:
setappdata(0,'some_var',value)
some_other_var = getappdata(0,'some_var')
You would use setappdata() in the m-file for fig1 to store whatever data you wanted to pass around, and then call getappdata() in another m-file to retrieve it. The argument 0 to the two functions specifies the MATLAB root workspace, which is accessible by your program everywhere (i.e. it is global). As such, when you close your figures that data will still be available. You may want to use rmappdata to remove them.
Method 2: Use guidata:
Assuming you created your GUI with GUIDE, then you have access to a structure called handles which is passed around everywhere and which you can edit, and so you can do this in a GUI callback:
handles.some_var = some_value
guidata(hObject,handles)
Then you can access handles.some_var elsewhere in some other callback (because handles is automatically passed into it for you) in your other m-file:
some_other_var = get(handles.some_var)
Method 3: Use UserData:
Store the variable you want from your first figure:
set(name_of_fig, 'UserData', some_var)
Then to get it from your other one:
some_other_var = get(name_of_fig, 'UserData')
(Disclaimer: My actual knowledge of MATLAB is not all that great, but it helps to be able to find good resources like this and this, and even this from the official docs. What I've written here may be wrong, so you should definitely consult the docs for more help.)
I would do like this (assuming you're using the GUI builder GUIDE).
Let's say that your figures/m-files are named firstFigure.fig/m and secondFigure.fig/m. In the code of firstFigure, just call secondFigure and pass your parameters as arguments:
someNumber = 1;
someText = 'test';
aMatrix = rand(3);
secondFigure(someNumber, someText, aMatrix);
The arguments will be available to secondFigure as a variable varargin in the callback functions
function varargout = secondFigure(varargin)
and
function secondFigure_OpeningFcn(hObject, eventdata, handles, varargin)
varagin is a cell structure; use cell2mat and char to convert it back:
theNumber = cell2mat(varargin(1));
theText = char(varargin(2));
theTextAgain = cell2mat(varargin(2));
theMatrix = cell2mat(varargin(3));
This may help:
http://www.mathworks.ch/matlabcentral/newsreader/view_thread/171989
The easiest method is to wrap the parameters in a cell array and send them directly to the GUI constructor. A call with two parameters might look like:
figure2({param1, param2})
Then you can unpack the arguments in the opening function (figure2_OpeningFcn) with code like:
handles.par1 = varargin{1}{1};
handles.par2 = varargin{1}{2};
These lines must be placed somewhere before the line that says guidata(hObject, handles);. Then you can access handles.par1 and handles.par2 directly in all the other callbacks.
I assume you are using GUIDE to generate your GUI. You can find figure2_OpeningFcn in figure2.m which will be located in the same directory as figure2.fig.
Note: you can also return values from a figure, returnvalue = my_figure({my_input}). If you'd like instructions on that too, leave a comment and I'll extend my answer.