warn_test
Test for (suppressed) Matlab warning message
Syntax
[waswarn,msgstr,warnid] = warn_test(oldstate, false) [waswarn,msgstr,warnid] = warn_test(oldstate, warnmsg, warnfunc,rwarnid)
Arguments
input
oldstate old warning state to restore (required) warnmsg string specifying (user-supplied) warning message (or 'false' to suppress warning) warnfunc string specifying which function issued the warning rwarnid report Matlab warning identifier
output
waswarn true if a warning was issued msgstr warning message warnid warning Matlab warning identifier
Description
Tests for Matlab warning suppressed by warn_supp; see also warning. After testing, the previous warning state (as returned by warn_supp) is restored.
The warn_supp ... warn_test routines exist for two reasons: (1) if routines issuing warnings are run in a loop (which they frequently are in the MVGC Toolbox), Matlab will by default spew confusing warnings, obscuring meaningful ouput; (2) we want to be able to issue meaningful context-dependent warning messages.
If warnmsg is a logical flag set to false, reporting of warning messages is suppressed (presumably the user will handle warnings based on the return values). Otherwise, warnmsg is interpreted as a user-defined warning message to report; if empty (default), the Matlab warning message is reported. A string specifying which function issued the warning may be supplied in warnfunc - if not present it defaults to the enclosing function. If the flag rwid is set, the Matlab warining identifier is reported (default: false).
Example
A = magic(6);
oldstate = warn_supp('MATLAB:nearlySingularMatrix');
B = inv(A);
warn_test(oldstate,'badly-conditioned matrix?');