Reading and plotting synchrotron data
2 views (last 30 days)
I get a lot of data by synchrotron measurements (type: *.dat). The structure of the data is as follows: One file containes the temperatures, this is already manually imported as one column with 512 rows. Now I have for all temperature-steps one seperate *.dat-file with three columns: first is the theta-value (x), the second is my intensity (y) and the third is the error (all together of course 512 files!). I need the for the plot the second column only of all files as one final matrix. Later the temperature will be the x-value, the theta-value will be the y and the intensity the z-value. That means that I am looking for a loop to import from all *.dat-files only the second column, the theta-value I will import seperately (handish). As result I need a 512x20000-matrix for the plot. How can I write this import-loop?
Many thanks for your help,
dpb on 27 May 2022
Where does the 20000 come from? Is that how many observations/measurements are in each of the 512 files, I guess?
Doesn't seem difficult, what's the file-naming convention and storage arrangement? Presuming there's a root name for each set or each set is saved in a folder of its own, simply iterating over the result of
nT=512; nO=20000; % sizes; be better to set dynamically
data(nT,nO)=0; % preallocate to size
I'd be inclined to test the performance in comparison to just read the full file and save only the desired column over the specific one-column-only read operation -- and also to read/save all the data going to need in the first operation instead of making multiple passes over the same files.
is "only" about 80 MB as double, that's just not all that much data any more.