Consider the following example
%%
a = 1:10;
%%
b = 11:20;
%%
c = 21:30
It is divided into 3 sections and I can call each section with Alt+Shift+Xseperately
but what If i want to call each section by call for example another file
testloadfile
d = a*5;
loads this data but it only needs a to use so calling the whole file would be waste of time and memory
can I call a specified section of code by call ? or it isnt possible
Somebody else answered this question here: Run particular cell section from command line in Matlab?
There is no native solution in Matlab to do what you ask. The linked answer uses a custom Matlab class to load the script and run particular code sections. Here is the code from the link (not written by me):
classdef cellRunner < handle
properties ( SetAccess = private )
fileName
fileInfo
cellInfo
cellNames = {};
end
methods
function obj = cellRunner ( file ) % constructor
if nargin == 0
obj.fileName = 'cellScript.m'; % default file for testing
else
obj.fileName = file; % store user file
end
obj.parseFile(); % read the file into memory
end
function obj = parseFile ( obj )
if ~isempty ( obj.fileInfo ) % on parsing check to see if its been parsed before
if isequal ( obj.fileInfo, dir ( obj.fileName ) ) % Check date stamp (has cell file been modified
% disp ( 'file not changed - reading skipped' ); % if not skip
% reading
return
end
end
obj.fileInfo = dir ( obj.fileName ); % store file info
fid = fopen ( obj.fileName ); % open file for reading
if fid ~= -1
index = 0; % this is the index of each cell
inCell = false; % has it found a cell to start reading
lines = cell(0);
while ( true )
line = fgetl ( fid ); % read the line in the file
if line == -1; break; end % check for the end of the file
sLine = strtrim ( line ); % trim any white space
if length ( sLine ) > 2 && strcmp ( sLine(1:2), '%%' ) % check to see if its the start of a cell
if index > 0 % Store the last cell data
obj.cellInfo{index} = lines; % in class to run when required
end
index = index + 1; % increment the index
obj.cellNames{index} = strtrim ( sLine(3:end) ); % save the name of the cell
lines = cell(0); % re-initialise the lines var
inCell = true; % the start of the cells have been found
elseif inCell % if reading a cell array
lines{end+1} = line; % add each line to the lines var
end
end
if index > 0 % make sure and save the last cell when finished reading
obj.cellInfo{index} = lines;
end
fclose ( fid );
else
error ( 'cellRunner:fileError', 'unable to read file' );
end
end
function obj = runCell ( obj, arg )
% obj.runCell ( 'cellName' );
% obj.runCell ( index );
obj.parseFile(); % check that the file hasn't been changed
if ischar ( arg ) % if user provided a char then search for it
index = strcmp ( arg, obj.cellNames ); % find the index
if ~any ( index ) % check it was found
error ( 'cellRunner:notFound', '%s not found', arg );
end
else
index = arg; % if index is an integer (not checked - assumed if not char)
if index < 1 || index > length ( obj.cellInfo ) % check integer is valid
error ( 'cellRunner:notFound', 'Index %d not found', arg );
end
end
commands = obj.cellInfo{index}{1}; % start to build the command to execute.
inBlock = false;
for ii=2:length(obj.cellInfo{index}) % loop around - ignoring any commented lines.
nextLine = strtrim ( obj.cellInfo{index}{ii} );
if inBlock
if length ( nextLine ) == 2 && strcmp ( nextLine, '%}' );
inBlock = false;
end
continue
end
if length ( nextLine ) == 2 && strcmp ( nextLine, '%{' );
inBlock = true;
continue
end
if length ( nextLine ) >= 1 && strcmp ( nextLine(1), '%' )
continue;
end
commands = sprintf ( '%s;%s', commands, obj.cellInfo{index}{ii} ); % build a parge string to eval
end
evalin('base',commands); % eval the expression in the base workspace.
end
end
end
If you name your script "myscript.m" and label your sections, you can use the above class as follows:
obj = cellRunner('myscript.m');
obj.runCell ( 'cellA' );
You can also use the block index like so
obj.runCell ( 3 );
Variables created in the code cells will be in the workspace just like if you had run them yourself
