LOADGENERICDATA Loads data of a specified type from file or data structure.
VAR = LOADGENERICDATA(VARFILE, VARTYPE)
VAR = LOADGENERICDATA(VARFILE, VARTYPE, FIELDS)
VAR = LOADGENERICDATA(VARFILE, VARTYPE, FIELDS, VARNAME)
VAR = LOADGENERICDATA(VARFILE, VARTYPE, FIELDS, VARNAME, ARGS)
Loads data from a variable or M-file or MAT-file and checks that it
matches a specified type.
Inputs:
VARFILE : Variable containing the data structure or a string
containing the name of a function M-file or a MAT-file
on the Matlab path. If no file extension is provided
it will attempt to load a MAT-file with that name and,
if not found, will call a function by that name to
get the data. The function M-file should return a
single argument containing the data. A MAT-file should
either contain a single variable with the desired data
or provide the variable name in VARNAME.
VARTYPE : String or cell array of strings with, in order of
priority, the data structure type to be returned.
Valid values are 'struct', 'cell' and 'array'.
FIELDS : (optional) String or cell array of strings containing
a list of required fields in case the VARTYPE is struct.
If a required field is missing it will throw an error.
VARNAME (optional) String containing the name of the variable to
extract when loading a MAT-file. If not provided, the
default is to extract the 1st variable, regardless of name.
ARGS : (optional) Scalar or cell array of values that are passed
as input function arguments to VARFILE if it is an M-file.
Output:
VAR : Returned data structure of the first matching VARTYPE.0001 function var = loadgenericdata(varfile, vartype, fields, varname, args) 0002 %LOADGENERICDATA Loads data of a specified type from file or data structure. 0003 % 0004 % VAR = LOADGENERICDATA(VARFILE, VARTYPE) 0005 % VAR = LOADGENERICDATA(VARFILE, VARTYPE, FIELDS) 0006 % VAR = LOADGENERICDATA(VARFILE, VARTYPE, FIELDS, VARNAME) 0007 % VAR = LOADGENERICDATA(VARFILE, VARTYPE, FIELDS, VARNAME, ARGS) 0008 % 0009 % Loads data from a variable or M-file or MAT-file and checks that it 0010 % matches a specified type. 0011 % 0012 % Inputs: 0013 % VARFILE : Variable containing the data structure or a string 0014 % containing the name of a function M-file or a MAT-file 0015 % on the Matlab path. If no file extension is provided 0016 % it will attempt to load a MAT-file with that name and, 0017 % if not found, will call a function by that name to 0018 % get the data. The function M-file should return a 0019 % single argument containing the data. A MAT-file should 0020 % either contain a single variable with the desired data 0021 % or provide the variable name in VARNAME. 0022 % VARTYPE : String or cell array of strings with, in order of 0023 % priority, the data structure type to be returned. 0024 % Valid values are 'struct', 'cell' and 'array'. 0025 % FIELDS : (optional) String or cell array of strings containing 0026 % a list of required fields in case the VARTYPE is struct. 0027 % If a required field is missing it will throw an error. 0028 % VARNAME (optional) String containing the name of the variable to 0029 % extract when loading a MAT-file. If not provided, the 0030 % default is to extract the 1st variable, regardless of name. 0031 % ARGS : (optional) Scalar or cell array of values that are passed 0032 % as input function arguments to VARFILE if it is an M-file. 0033 % 0034 % Output: 0035 % VAR : Returned data structure of the first matching VARTYPE. 0036 0037 % MOST 0038 % Copyright (c) 2013-2016, Power Systems Engineering Research Center (PSERC) 0039 % by Daniel Munoz-Alvarez and Ray Zimmerman, PSERC Cornell 0040 % 0041 % This file is part of MOST. 0042 % Covered by the 3-clause BSD License (see LICENSE file for details). 0043 % See http://www.pserc.cornell.edu/matpower/ for more info. 0044 0045 if isempty(varfile) 0046 var = []; 0047 return; 0048 end 0049 if nargin < 5 0050 args = []; 0051 if nargin < 4 0052 varname = ''; 0053 if nargin < 3 0054 fields = {}; 0055 end 0056 end 0057 end 0058 0059 if ischar(varfile) %% it's a file name 0060 %% check for explicit extension 0061 l = length(varfile); 0062 if l > 2 0063 if strcmp(varfile(l-1:l), '.m') 0064 rootname = varfile(1:l-2); 0065 extension = '.m'; 0066 elseif l > 4 0067 if strcmp(varfile(l-3:l), '.mat') 0068 rootname = varfile(1:l-4); 0069 extension = '.mat'; 0070 end 0071 end 0072 end 0073 0074 %% set extension if not specified explicitly 0075 if ~exist('rootname', 'var') 0076 rootname = varfile; 0077 if exist([rootname '.mat'], 'file') == 2 0078 extension = '.mat'; 0079 elseif exist([rootname '.m'], 'file') == 2 0080 extension = '.m'; 0081 else 0082 error('loadgenericdata: No file named ''%s.mat'' or ''%s.m'' found in Matlab path.', rootname, rootname); 0083 end 0084 end 0085 0086 %% attempt to read file 0087 if strcmp(extension,'.mat') %% from MAT file 0088 s = load(rootname); 0089 if isempty(varname) 0090 f = fieldnames(s); 0091 var = s.(f{1}); %% use first variable if not specified 0092 elseif isfield(s, varname) 0093 var = s.(varname); %% use specified variable 0094 else 0095 error('loadgenericdata: No variable named ''%s'' in ''%s.mat''', varname, rootname); 0096 end 0097 elseif strcmp(extension,'.m') %% from M file 0098 if isempty(args) 0099 var = feval(rootname); 0100 elseif iscell(args) 0101 var = feval(rootname, args{:}); 0102 else 0103 var = feval(rootname, args); 0104 end 0105 end 0106 else %% it's a data structure, not a file name 0107 var = varfile; 0108 end 0109 0110 %% check the provided types 0111 if ~iscell(vartype) 0112 vartype = {vartype}; %% convert string to single element cell array 0113 end 0114 if ~iscell(fields) && ~isempty(fields) 0115 fields = {fields}; %% convert string to single element cell array 0116 end 0117 done = false; 0118 for i = length(vartype) 0119 switch vartype{i} 0120 case 'struct' 0121 if isstruct(var) 0122 for j = 1:length(fields) 0123 if ~ischar(fields{j}) 0124 error('loadgenericdata: FIELDS input must be a string or cell array of strings.') 0125 end 0126 if ~isfield(var, fields{j}) 0127 error('loadgenericdata:missingfield', 'loadgenericdata: field ''%s'' missing from struct data.', fields{j}); 0128 end 0129 end 0130 done = true; break; %% struct OK 0131 end 0132 0133 case 'cell' 0134 if iscell(var) 0135 done = true; break; %% cell array OK 0136 end 0137 0138 case 'array' 0139 if isnumeric(var) 0140 done = true; break; %% array OK 0141 end 0142 otherwise 0143 error('loadgenericdata: ''%s'' is not a valid value for VARTYPE', vartype{i}); 0144 end 0145 end 0146 if ~done 0147 error('loadgenericdata: data not found in any of the specified formats'); 0148 end