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Closed 10 years ago.
I'm developing a web platform that will show data tables and charts using highchart.
Besides there is an exporting function for user to download csv/excel file.
But i'm thinking why I should make this. It's likely that exporting csv or excel is the standard. But is there any advantage?
I think I can export html file instead and the page will be interactive and much better than excel file. Is there anyone have idea about this problem?
A CSV allows the user greater control over how they display the data - you may see some great visualisations from your users if you give them access to these.
Likely, the people who will actually use the CSVs (which will be a small percentage) would scrape the data anyway - so offering them up saves bandwidth and increases the happiness of your userbase because they don't have to go through the effort of writing a scraper.
It all depends on the type of data, though.
Related
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Closed 9 years ago.
We are planing to do some visualization for our existing data its a political and news domain.
After doing my initial research I came to conclusion for using R and D3.
My requirement is the tool should be able to give dynamically, since it is web based visualization (Visualization should be able to change upon change in value)
I have following questions and need help in those.
Is there any other tool which I can use.
R can be use for dynamic visuals? (My application is in php, python based solution can also be ok)
Then you'd need to look into Rook, How to set up an R based service on a web page, or (better) Shiny, How to integrate R shiny into current application.
If your application (or some parts) is already in python you can use rpy2 as a bridge between R and python.
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Closed 9 years ago.
I am looking for a package to download historical data of Futures (NO STOCK DATA).
could someone advice me some good R package?
Thanks!
P.S. I Know there are many packages, but they only seem to retrive stock prices, and not Futures. I Only need futures.
There is no free source of futures data. Atleast not comprehensive.
You can look into 'FinancialInstruments` package's source on R-Forge especially this file
https://r-forge.r-project.org/scm/viewvc.php/pkg/FinancialInstrument/inst/parser/download.tblox.R?view=markup&root=blotter
It will download historical data for select futures which TradingBlox publishes daily. Mind you this data is back adjusted continuous contract data and is created using TradingBlox's own methodology of back adjusting.
Among paid sources, CSI data is reasonably priced for smaller traders and can give data in multiple formats and allows you to customize back adjustment logic.
There is interesting project Quandl but I really haven't seen it mentioned around much or tested accuracy of the data.
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Closed 10 years ago.
I googled a lot but could not get a suitable tool.
I have a .NET application. To make the reporting feature much better, I am trying to find a third party tool for reporting as well as capable to generate the reports as pdf, jpg etc.
The main thing is to design the reports by the end-user as per their needs. I checked Cognos, I found that it gives the output as grid like style but I need in a customized manner too.
I got the below third party tools.
Fast Reports
Jreport
Cognos
Combit
I need a tool, that is very easy from end-user's prospect.
Any suggestion will be helpful.
If you want end users to design their own reports on demand, have you tried the new Power View (SQL Serves 2012)?
http://www.microsoft.com/en-us/bi/Products/PowerView.aspx
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Closed 10 years ago.
I have spent quite some time trying to learn WF4 (I'm a total n00b when it comes to WF), but I cannot seem to find any examples exactly what I’m trying to do:
I need to make a WF4 (C#) rule during runtime, save it to a database (currently SQL, but that’s not important to me), load the rule and execute it while still in runtime.
The two examples below indicate that this (loading and executing a rule made during runtime) should be possible:
http://www.nilzorblog.com/2011/11/using-wf4-as-rule-engine.html
http://msdn.microsoft.com/en-us/library/vstudio/ee960221(v=vs.100).aspx
I have got the two examples working independently without problems.
However, when I’ve tried combining the examples (which should be quite simple?) I constantly get loads of conversion errors like this:
Argument 2: cannot convert from 'System.Collections.Generic.List < SharedLibrary.AssignmentRule > ' to 'System.Collections.Generic.List < ExternalRuleSetLibrary.RuleSetData > '
I have searched far and wide for days for examples that does this right, but didn't find anything. This is why I'm asking the gurus here :) Thank you in advance!
Can you provide an example or recipe of how to make a WF4 rule during runtime, save it to a database, load the rule and execute it while still in runtime?
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Closed 10 years ago.
We are going to develope one web application using Asp.Net which can have millions of data to handle
so i am confuse between database selection
which should i prefer sql server or oracle with respect to performance and all criteria
please guide me on this
thanks
Your question is looks subjective, how ever I like to answer and say that:
If some one gives you to drive a formula one, in how many seconds you gong to crash it? Probably you do not even manage to start it running.
The same think is on programming. Both programs are like formula one, maybe one have some feature and the other have some other, but they can run so fast if "you can drive them" like that.
Now it's up to you to make a good design to the database and make it real fast, or very slow and huge. It's not the machine, it you that you can make it run fast. It's not the formula one on the races, it’s the pilot (and the rest team) that they drive them so fast.