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Brian


Thrivent Financial for Lutherans

Last seen: mehr als 2 Jahre ago Active since 2011

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Matlab Clustering technique with textual data
Hi, I am trying to figure out the best way to cluster numeric information (stock returns) using a series of textual information....

mehr als 5 Jahre ago | 1 answer | 0

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answer

Question


How do I efficiently make a large SQL query into Matlab?
I have a SQL table that contains data that I need for analysis which is about 60 million records and 5 fields. What is the best ...

mehr als 6 Jahre ago | 1 answer | 1

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answer

Question


Why does Matlab add digits to a code generated vector?
I have a simple command that is creating a vector. Test = (51.7:.1:130)' I then iterate through this vector and use the valu...

mehr als 6 Jahre ago | 1 answer | 0

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answer

Question


Table to Matrix from SQL Query
Hi, I have a large SQL query that is importing data into my workspace. I intend to create a data matrix and accompanying label v...

mehr als 6 Jahre ago | 0 answers | 0

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answers

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Parallel Computing with hyper-threading
I run some of my programs via the parallel computing toolbox using a reasonably powerful machine (20 Cores) to accomplish long r...

etwa 7 Jahre ago | 0 answers | 0

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answers

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Spreadsheet LinkEX and datetime fields
Hi, I use the Spreadsheet Link EX to transfer data from Matlab to excel quite frequently. Since the datetime data type was intro...

etwa 7 Jahre ago | 0 answers | 0

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answers

Question


GRPSTATS and datetime columns
Hi, I use grpstats to calculate statistics by different variables often. The new datetime format is very useful and I have conve...

etwa 7 Jahre ago | 1 answer | 0

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grpstats flexibility for additional functions
Hi, I am just wondering if the grpstats function can be used with things other than the standard formulas listed on the help pag...

etwa 7 Jahre ago | 1 answer | 0

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Question


Plot single vector from 3D array
I have a 5x5x150 3d array where I am saving a time series of correlations between variables. At the end of my code I'm attemptin...

mehr als 7 Jahre ago | 1 answer | 1

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answer

Question


Slow or Laggy Matlab Workspace
Matlab has become unusually unresponsive when I allow it to sit for some time (a few hours to a few days). The type of slowness ...

mehr als 7 Jahre ago | 5 answers | 3

5

answers

Question


Join or Merge Data
Hi, I have two large cells that I need to effectively "JOIN" together via two fields (one text and one numeric). Say one cell ha...

fast 8 Jahre ago | 1 answer | 0

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answer

Question


Help Optimize slow Datestr() function performance
I have imported a large text file with textual dates in the format m/d/yyyy. The end result that I need is a numeric date (for e...

mehr als 8 Jahre ago | 1 answer | 0

1

answer

Question


Fastest way to import single column?
I am attempting to import just a single column (a textual date field) from a large file with many columns and many rows. When I ...

mehr als 8 Jahre ago | 2 answers | 0

2

answers

Question


Export Data via fprintf printing something else besides NaN
Hi, I have a simple export loop that is writing the contents of a matrix to a text file for another system to read. The issue is...

mehr als 8 Jahre ago | 1 answer | 0

1

answer

Question


Fastest Way to write data to a text file - fprintf
I am writing a lot of date to a text file one line at a time (1.7 million rows, 4 columns) that is comprised of different data t...

fast 9 Jahre ago | 2 answers | 1

2

answers

Question


Matlab Slow Import using Import preview
I am using the Import function in Matlab to preview the file before import. The file I am importing is rather large (500 MB or s...

etwa 9 Jahre ago | 1 answer | 0

1

answer

Question


Database toolbox query not returning all records
I have a fairly simply SQL query that I am running using the database toolbox connecting to a DB2 datasource. For some reason my...

mehr als 9 Jahre ago | 0 answers | 0

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answers

Question


How Can I Speed Up My Code
I've got a job that is running a bunch of iterations on a large dataset and taking more time than I'd like. While I'd like to wr...

mehr als 9 Jahre ago | 2 answers | 0

2

answers

Question


Use eval statement to create Matrices with variables
I am having trouble with some seemingly basic eval syntax. I have a few variables in loops that I'd like to use to create the na...

mehr als 9 Jahre ago | 2 answers | 0

2

answers

Question


Create location Index from cell arrays
I have a small piece of code that loops through an array and creates an Index location of that value in another cell array. Acco...

fast 10 Jahre ago | 1 answer | 0

1

answer

Question


Importing Matrix from text or csv files
I have a large matrix that I'd like to import, preferably in one command into a few different Matlab variables. I have been atte...

fast 10 Jahre ago | 1 answer | 0

1

answer

Question


Enable Parfor or Vectorization
I'm looking for a faster way to calculate these loops. I've read some about vectorization on Loren's page but I'm not sure that ...

fast 10 Jahre ago | 0 answers | 0

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answers

Question


Fast Export Method
I have always used the export command to export a dataset to a comma delimited text file. When the files get a little larger (50...

fast 10 Jahre ago | 1 answer | 0

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answer

Question


Parfor Step
I am attempting to run a ParFor statement with a step function and Matlab is giving me an error "The range of a parfor statement...

fast 10 Jahre ago | 1 answer | 0

1

answer

Question


Matrix to Table format
I have a very large file that received in a matrix format. Because I'm going to write the data to a SQL database table I need to...

fast 10 Jahre ago | 1 answer | 0

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answer

Question


Parfor Loops
I have the parallel computing toolbox but I have trouble writing loops in a manner that the toolbox likes. Can someone make a su...

fast 10 Jahre ago | 2 answers | 0

2

answers

Question


Scheduling a Matlab Script
I am attempting to schedule a Matlab job each day using the windows scheduler. I am having trouble getting it to run my m file. ...

fast 10 Jahre ago | 1 answer | 1

1

answer

Question


Matlab Database Toolbox
What is an easy way to create table joints using the querybuilder that is available for the database toolbox? I'm just looking f...

etwa 10 Jahre ago | 2 answers | 0

2

answers

Question


Matlab Database Toolbox join
I am wrting a SQL query to pull a list of securities from a table that I am connecting to via ODBC connection. What I'd like to ...

etwa 10 Jahre ago | 1 answer | 2

1

answer

Question


Import from .txt or .csv
I am importing some large .csv files where I have textual column headers and row headers. I am using the readtext() function fro...

etwa 10 Jahre ago | 1 answer | 0

1

answer

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