thomas-nilsson-irfu
commented
3 years ago Dear @neetasha,
one thing which we have perhaps not explained that well for new users is that the code in the mms.db_* functions will look for data in subfolders to the path provided with mms.db_init and that the subfolder structure should be similar to that of MMS SDC (see for instance https://lasp.colorado.edu/mms/sdc/public/data/mms1/fgm/brst/l2/2016/11/28/). That is to say specifically for burst data only it is to be sorted in one more level (daily subfolder) compared with the NASA cdaweb which put all files in subfolder down to month only (see https://cdaweb.gsfc.nasa.gov/pub/data/mms/mms1/fgm/brst/l2/2016/11/). Monthly folders is however the lowest level subfolder for survey (fast/slow) data at MMS SDC and NASA cdaweb.
Did you create such a folder structure in your local downloaded root-path which you used with mms.db_inti()?
I.e. for mms.db_init('local_file_db','c:\Whatever\Your\Path\'), do you have subfolders mms1, mms2, mms3, mms4 in this example path c:\Whatever\Your\Path\, and in these subfolder do you have next level subfolders fgm and so on down to daily folders for burst data?
I think there might be a typo in your command, fgms should be simply fgm as per the file names at MMS SDC and NASA cdaweb (see for instance: https://lasp.colorado.edu/mms/sdc/public/data/mms1/fgm/brst/l2/2016/11/28/).
And just minor question: are you running with a 64 bit installation? (There is a checkbox A 64-bit installation of MATLAB was used. in our bug template which you left unchecked / did not put an X inside of). The reason we have this checkbox and that I'm asking now is that some of the code specifically used to read the cdf files is dependent upon compiled mex files which are only tested on our end for 64-bit installations. If you run on a 32bit version it could be that these fail and are not able to read the cdf files and return any data from your download into Matlab.
neetasha
Step 1: Latest code?
git pullthis is still a problem).Step 2: Describe your environment
Step 3: Describe the problem
Hello sir/mam, I am new to the field of space data analysis. I am using irfu-matlab devel package of GitHub for data analysis of MMS spacecraft. Initially I started with few examples (\plots\examples) which access data from CAA. Later I started with MMS examples (\plots\mms) given in the irfu-matlab devel. There I am stuck with the function cval.m I downloaded the data form cdaweb for 2016-11-28 from MMS spacecraft and stored that data into the current folder irf-devel (irfu-devel\data). After evaluating mms.init(), I started using examples where cval.m is showing no data base present. Sometimes it gives the result matrix say B=[], but with 0X0 matrix i.e. data has not been read by it.
Will you Please try to guide me with this issue?
Expected behavior The function ,"c_eval('Bxyz1=mms.db_get_ts(''mms1_fgms_brst_l2_20161128072930_20161128073119'',''mms1_fgm_b_gse_brst_l2'',Tint);');" should show the values of B1 which are magnetic field data taken from cdaweb website. The first entry inside the () is file name, the second entry is variable name of the file while the third entry if Time, which is Tint = irf.tint mms1_fgms_brst_l2_20161128072930_20161128073119.zip
('2016-11-28T07:29:00.00Z/2016-11-28T07:31:30.00Z');
Actual behavior The function when used shows B1 with 0X0 matrix i.e. no data find. The data file which I am using is attached below. Please do refer it.
mms1_fgms_brst_l2_20161128072930_20161128073119.zip