You would just have to open and then read the node data file line by line using the standard matlab functions, define a condition with a keyword such as "GRID" so the code identifies the line that contains the information you wish to read. Then specify the character location range (column number) to assign it as a string to a variables. You may have to convert the format if you wish to do calculations, etc with these strings. Code should look something like the one below. This is just a sample. It would generally require some tweeking to fit your file. Cheers!
Note:
- Nastran files have standard "CARD" format and character allocations to make this type of read/write tasks pretty general
- Column numbers of characters are displayed in Notepad/Notepad++ in the lower right
fid=fopen(filename);
status=fseek(fid111,0,'eof');
EOF=ftell(fid111);
currentFPI=fseek(fid111,0,'bof');
while currentFPI<EOF
linestr=fgetl(fid111);currentFPI=ftell(fid111);
str=findstr(linestr(1:4),'GRID'); % (1:4) is just an example. Specify correct character location (column number)
XX=77 % max line length
if length(linef06)>=XX && isempty(str)==0 % you may need to specify different conditions here to make sure ONLY the required lines are being read
linef06=fgetl(fid111);currentFPI=ftell(fid111);
% linef06=fgetl(fid111);currentFPI=ftell(fid111);
% each fgetl command takes you to next line. Make sure you use the required number of "fgetl"
% (i.e. no lines with required data are missed or lines with wrong data is read)
gridnum=str2num(linestr(1:4));
% similarly other data columns
end
end
fclose(fid);
