Add code snippets

matlab/catalog/extractColumns.m

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+%
+% -----------------
+% Copyright © 2019 ACK Cyfronet AGH, Poland. 
+%
+% This work was partially funded by EPOS Project funded in frame of PL-POIR4.2
+% --------------
+%
+function [varargout] = extractColumns(catalog, varargin)
+    for i=1:length(varargin)
+        colName = varargin{i};
+        varargout{i} = findColumn(catalog, colName);
+    end
+end
+
+function column = findColumn(catalog, colName)
+    for c=1:length(catalog)
+        if strcmp(catalog(c).field, colName)
+            column = catalog(c).val;
+            break;
+        end
+    end
+    if exist('column') ~= 1
+        error('no column named %s', colName);
+    end
+end