Can not read in a cdf

I am rather new to MATLAB and I am trying to read in a cdf file. After downloading a patch, i entered "addpath 'C:\matlab-cdf_patch'" then tried to read in the cdf file with "data=cdfread('test.cdf')"... from there I get the errors:

Undefined function 'cdfinfoc' for input arguments of type 'char'.

Error in cdfinfo (line 165) tmp = cdfinfoc(filename);

Error in cdfread (line 216) info = cdfinfo(filename);

and do not know what they mean. Please help, thank you

Answer 1

[Fangjun Jiang]

Where did you download the patch? What version of MATLAB are you using? Can you try to run the following command to see if there is any error?

which example.cdf -all;
cdfinfo('example.cdf');
data=cdfread('example.cdf')

[Anthony]

I downloaded the patch from:

http://cdf.gsfc.nasa.gov/html/matlab_cdf_patch.html

I am using the MATLAB trial because I want to make sure it can perform my necessary operations before purchase. After typing in the following commands, these are the errors I received:

Trial>> which test.cdf -all

C:...\...\...(file path)\test.cdf

Trial>> cdfinfo('test.cdf')

Undefined function 'cdfinfoc' for input arguments of type 'char'.

Error in cdfinfo (line 165)

tmp = cdfinfoc(filename);

Thank you for your help

[Fangjun Jiang]

MATLAB provides a cdfread() function. I don't know why do you need to download a patch from NASA website. Remove your 'C:\matlab-cdf_patch' folder from your MATLAB path to see if you already have the cdfread() function by typing

which cdfread -all

The 'example.cdf' file is provided by MATLAB too. I was trying to tell you to go through that example to see if cdfread() can read it correctly. Here is a link to the document of cdfread(). http://www.mathworks.com/help/techdoc/ref/cdfread.html. It was available at least in R2007b. You can get that help by typing help cdfread.