I have written a Matlab script to perform some analysis on audio samples recorded at different locations. I have a mobile app that records audio and stores it on a web server. Is there a way I can access this file from Matlab as an input to the script? The url and individual file names will be available, I assume there is a Matlab command that uses this information.
Thanks,
Try something like this:
str = urlread('http://stackoverflow.com');
Related
Is there a place to find sample CFD data in this format please?
I am trying to create scripts for Paraview to automate files opening and want to use the track function.
Data from this article can be used to test out the file format:
I need to play a mp3 file from gridfs in mongodb. I will get a file-like object instead filename (to the system disk).
I cannot find anyway to use SoundLoader to play the file like object directly. I checked the code here https://kivy.org/docs/_modules/kivy/core/audio.html. it seems that kivy audio does not suppot it. Am I right? I mean, like wave module, you can open it with file like object. I prefer not to use wave because it may has issues in different OSs.
wave.open(file[, mode])
If file is a string, open the file by that
name, otherwise treat it as a seekable file-like object.
Any other way to load the data to SouldLoader instead of filename? Many thanks.
This may not be a direct answer but could be an alternative for now. I can use GridFSBucket in GridFS to download the file in stream then save temp file to disk. Finally load by SoundLoader. With this way, it would solve the problem with large media file issue. This solution also works for image or video but require some disk storage of course.
Is it possible to create PDF documents (e.g. on a nightly schedule) with Tableau and have those documents exposed by a URL by the Tableau server?
This sort of approach is common in the Jasper Reports and BIRT world, so I was wondering if the same approach is possible with Tableau?
I couldn't see any documentation on the Tableau site for creating PDFs, other than print to PDF
With Tableau Server, you can access your published workbook in a pdf format with this URL:
http://nameofyourtableauserver/views/NameOfYourWorkbook/NameOfYourView.pdf
Simply, the url is the url of your view + you add ".pdf".
The pdf file will be generated dynamically when accessing the URL.
Another option is to program your own script with tabcmd.
You can have more info on tabcmd here: http://kb.tableausoftware.com/articles/knowledgebase/using-tabcmd
The same technique also works for PNG. You can control filters using ?field_name=value. You can even select multiple values like this ?field_name=value1,value2.
Parameters can be set the same way.
Personally I've had the best luck with discrete dimensions instead of continuous ones.
I use the Windows Task Scheduler with batch files and Tabcmd.
Programs needed:
Tabcmd
Windows TaskScheduler (All Programs- Accessories - system tools)
http://onlinehelp.tableausoftware.com/v8.1/server/en-us/tabcmd_overview.htm
(tabcmd, how it works?)
Batchfile (create a text file and then save with file extension .bat):
1- Locate tabcmd and login
2- use function tabcmd get "http:\..." and -f "C:...pdf" to save to file.
3- concatenate the filters you want to use to the end of your URL as shown in other answers(all filters on the view must be included(filled out))
4- Save Batch file
Windows Task Scheduler:
1- create a task that will execute the batch file
2- TEST
You can do this by typing
http://server/views/WorkbookName/SheetName.pdf?:format=pdf
Another option will be using javascript api like below..
function exportPDF() {
viz.showExportPDFDialog();
}
I am going through someone's data analysis files (created in an older version of matlab) and trying to find out what a particular .mat file is that was used in a matlab script.
I am trying to load a .mat file in matlab. I want to see what is in it.
When I type...
load ('file.mat')
the file loads and I see two variables appear in the workspace. jobhelp and jobs.
When I try to open jobs by typing the following in the matlab command window...
jobs
the response is..
jobs =
[1x1 struct]
Does this mean that there is only a 1 x 1 structure in the .mat file? If so, how in the world do I see what it is? I'm even happy to load it in unix, but I don't know how to do that either. Any help would be greatly appreciated as I have a few files like this that I can't get any information from.
Again, a new user, so please make it simple.
Thanks
It means that jobs is a cell array {} and within this cell array is a structure defined
To see the structure and its contents type jobs{1}
I think you are dealing with a SPM5 Batch-File. This variable is an image of the tree-like structure you can see in the Batch-Editor of SPM. Your job consists of one subitem (stats) which could have various subsubitems (like fMRI model specification, model estimation and so on).
To access this structure on the command line just proceed like Nick said:
Each level is a separate cell array that you can access with {#} after the name of the level. Example: jobs{1} shows you that there is a subitem named stats.
Subitems in structs are accessed with a dot. Example: jobes{1}.stats{1} shows you the subitems of the stats-entry.
Notice that there could be more than one entry on each layer: A stats module could (and probably would) contain various subitems. You can access them via jobs{1}.stat{2}, jobs{1}.stats{3} and so on.
The last layer would be the interesting one for you: The structures in here is an image of the options you can choose in the batch-editor.
I have developed an trade automator in excel, but its too slow, now im trying to do this in matlab.
One of the links I use to feed my sheets in excel is :
=TWSVR|CMA!'0012PETR4;25'
I'm trying to receive the same data in matlab, here is what I did:
channel = ddeinit('TWSVR','CMA')
lastPetr = ddeadv(channel,'0012PETR4;25',callback)
So is this right? Where can I see the data? Where is stored?
This callback function is the one I have to developed to process the data?
Matlab does not support DDE any more. You can still use DDE, but you may run into troubles.
For data exchange with Excel, I would suggest using xlsread, xlswrite and xlsfinfo instead.