MATLAB: Does the import data wizard take a very long time to open in MATLAB 7.2 (R2006a)

hanglongMATLABslowspeedtimeuiimport

I am attempting to import a 500kB text file. I select the "File->Import Data…" option from the MATLAB menu and select the file. Nothing seems to happen and MATLAB is mostly frozen. Finally about 8 minutes later, the import wizard appears.

Best Answer

In some cases, the Import Wizard takes a long time to do the initial loading and display of the data in MATLAB 7.2 (R2006a).

To work around this issue, use the IMPORTDATA function or one of the other file IO commands. For more information on Importing Files please see the Tech Note listed below. These commands take only a fraction of the time required by the Import Wizard.

Related Solutions

MATLAB: Do I receive numeric as well as string data when I use IMPORTDATA and LOAD to import a text file in MATLAB 7.2 (R2006a)

This is the intended behavior of the LOAD function. LOAD imports only numerical data and it would fail when there are double quotes mixed in the numerical data.

To import numerical text data with double quotes mixed in, use TEXTSCAN with the %q option to bring in the text file as a cell array of strings. You can then use STR2NUM and RESHAPE to convert the data into a DOUBLE matrix of the proper dimensions as shown in the example code:

fid = fopen('sample.txt');      % Open the file
data = textscan(fid,'%q');      % Read in the data
fclose(fid);                    % Close the file
a = cellfun(@str2num,data{1});  % Convert the string into numbers
clear data;                     % Data is no longer needed; remove it from memory
a = reshape(a,2,26);       % Resize the matrix into the Nx26 column format

MATLAB: Is there a way to not replicate the preferences of MATLAB 7.1 (R14SP3) in the new installation of MATLAB 7.2 (R2006a)

The ability to install MATLAB with default values of preferences when MATLAB 7.1 (R14SP3) is already installed is not available in MATLAB 7.2 (R2006a).

When you install R2006a, MATLAB creates a new preference folder and migrates the files in the R14SP3 preferences directory to the R2006a preferences directly.

To work around this issue, delete the contents of the preferences folder used by MATLAB 7.2 (R2006a). Note that the folder also contains files like history.m, which you do not have to delete. The preferences folder for R2006a is determined by running

 prefdir

in the MATLAB Command Window.

When you next start MATLAB 7.2 (R2006a), new preferences, the R2006a defaults, will be generated and stored.

Best Answer

Related Solutions

MATLAB: Do I receive numeric as well as string data when I use IMPORTDATA and LOAD to import a text file in MATLAB 7.2 (R2006a)

MATLAB: Is there a way to not replicate the preferences of MATLAB 7.1 (R14SP3) in the new installation of MATLAB 7.2 (R2006a)

Related Question