38 lines
1.3 KiB
Matlab
Executable File
38 lines
1.3 KiB
Matlab
Executable File
% this function looks for occurrences of the endogenous variables in
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% endo_names in the input string constraint
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% all occurrences of the endogenous variables are appended a suffix
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% if the invert_switch is true, the direction of the inequality in the
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% constraint is inverted
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function constraint1 = process_constraint(constraint,suffix,endo_names,invert_switch)
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% create a list of delimiters that can separate parameters and endogenoous
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% variables in the string that expresses the constraint
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delimiters = char(',',';','(',')','+','-','^','*','/',' ','>','<','=');
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% split the string that holds the constraint into tokens
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tokens = tokenize(constraint,delimiters);
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ntokens = length(tokens);
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% search for tokens that match the list of endogenous variables
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for i=1:ntokens
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if ~isempty(find(strcmp(tokens(i),endo_names)))
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% when there is a match with an endogenous variable append the
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% suffix
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tokens(i) = cellstr([char(tokens(i)),suffix]);
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end
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% if the invert_switch is true
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% reverse the direction of the inequality
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if invert_switch
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if strcmp(tokens(i),cellstr('>'))
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tokens(i) = cellstr('<');
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elseif strcmp(tokens(i),cellstr('<'))
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tokens(i) = cellstr('>');
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end
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end
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end
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% reassemble the tokens to create a string that expresses the constraint
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constraint1 = strmerge(tokens); |