VertConcatenated Parsing of Respective Function Outputs

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Mark Whirdy
Mark Whirdy 2014-9-21
评论： Guillaume 2014-9-22
Hi all I need a little help with syntax here, trying to vertically concatenate the respective outputs [c,ceq] from functions fcn1 and fcn2 below So [c,ceq] should be
c = [1;2;3;4] % concat of [1;2;] & [3;4]
ceq = [5;6] % concat of [] & [5;6]
For context, fcn will be a nonlinear constraint function for an fmincon, which can be comprised of potentially several fcn1,fcn2,fcn3.
all the best,
Mark
function [c,ceq] = TestFunctionDualOutputParsing
fcn = @(x) deal(fcn1(x),fcn2(x)); % doesn't work
[c,ceq] = fcn(1);
function [c1,ceq1] = fcn1(x)
c1 = [1;2].*x;
ceq1 = [].*x;
function [c2,ceq2] = fcn2(x)
c2 = [3;4].*x;
ceq2 = [5;6].*x;

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回答（1 个）

Guillaume
Guillaume 2014-9-21
Unfortunately, in matlab, there is no way to pass the second or later output of a function directly to another function. You have to use a temporary variable, which precludes doing it in an anonymous function. You don't have a choice but to implement it as a standard function:
function [c, ceq] = fcn(x)
[c1, ceq1] = fcn1(x);
[c2, ceq2] = fcn2(x);
c = [c1; c2];
ceq = [ceq1; ceq2];
end
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Guillaume
Guillaume 2014-9-22
Right, sorry I missed that you would have a varying number of function handles. The following will work:
function [out1, out2] = dispatch2output(x, varargin)
[out1, out2] = cellfun(@(fn) fn(x), varargin, 'uni', false);
out1 = vertcat(out1{:});
out2 = vertcat(out2{:});
end
You call it with:
[c, ceq] = dispatch2output(x, @fcn1);
[c, ceq] = dispatch2output(x, @fcn1, @fcn2);
[c, ceq] = dispatch2output(x, @fcn1, @fcn2, @fcn3);
Guillaume
Guillaume 2014-9-22
Finally, a generalisation of dispatch2output to any number of outputs:
function varargout = dispatchNoutput(x, varargin)
fnouts = cell(1, nargout);
[fnouts{:}] = cellfun(@(fn) fn(x), varargin, 'uni', false);
varargout = cellfun(@(c) vertcat(c{:}), fnouts, 'uni', false);
end

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