If loop with character and two conditions

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Andreas Bull
Andreas Bull 2021-4-13
评论： J Chen 2021-4-13
Hello,
I am trying to create a loop, where I have ran two hypothesis tests, (ADF and KPSS test). And I want matlab to return the concltion in the command window, there is three outcomes, based on the conclution from the test.
This is what I got so far, but the problem is that in the case where the variable is not equal matlab returns: "Arrays have incompatible sizes for this operation."...
% Stationarity conclution loop
if t_adf_fdiff.reject == t_kpss_fdiff.reject
disp('Inconclusive test');
if isequal(t_adf_fdiff.reject, 'reject H0') &&...
isequal(t_kpss_fdiff.reject, 'do not reject H0')
disp(['The time series does not containt a unit root, and are '...
'stationary']);
if isequal(t_adf_fdiff.reject, 'do not reject H0') &&...
isequal(t_kpss_fdiff.reject, 'reject H0')
disp(['The time series containt a unit root, and are not'...
'stationary']);
end
end
end

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回答（1 个）

J Chen
J Chen 2021-4-13
编辑：J Chen 2021-4-13
Use
strcmp(t_adf_fdiff.reject,t_kpss_fdiff.reject)
insteafd of t_adf_fdiff.reject == t_kpss_fdiff.reject. The two if statements under the top if statement are meaningless since t_adf_fdiff.reject will be always equal to t_kpss_fdiff.reject.
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Andreas Bull
Andreas Bull 2021-4-13
Isn´t for example the first example...
if isequal(t_adf.reject, 'reject H0') &&...
isequal(t_kpss_level.reject, 'do not reject H0')
The same as saying: "if t_adf = reject and t_kpss = do not reject"
In that case this statement can be true.
J Chen
J Chen 2021-4-13
The strcmp(t_adf.reject,t_kpss_level.reject) will not be true in the first place in this case.

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