What does "underscore symbol" mean in a matlab function documentation?
23 views (last 30 days)
Show older comments
Hi,
I read in this documentation:
that for output 'status'
[___,status] = estimateGeometricTransform(matchedPoints1,matchedPoints2,transformType)
but what does "___" mean?
I tried with
[~,status] = estimateGeometricTransform(matchedPoints1,matchedPoints2,transformType)
and
[tform,status] = estimateGeometricTransform(matchedPoints1,matchedPoints2,transformType)
but i can not get out status variable and it returns an error:
Error using coder.internal.errorIf (line 9)
MATCHED_POINTS1 and MATCHED_POINTS2 do not have enough points.
Error in estimateGeometricTransform>checkRuntimeStatus (line 167)
coder.internal.errorIf(status==statusCode.NotEnoughPts, ...
Error in estimateGeometricTransform (line 149)
checkRuntimeStatus(statusCode, status);
0 Comments
Answers (2)
Dima Lisin
on 17 Mar 2015
Hi Marco,
If you look at the description of the transformType parameter in the documentation, you will see a table listing the minimum number of matched points required for each type of transformation.
Walter Roberson
on 18 Dec 2013
The _ stands in for "any of the other forms listed already". So "tform" or the three-output form can both be followed by "status" as an output.
What size() are your matchedPoints1, matchedPoints2 ? The routine thinks that you are not passing in enough points (enough rows) to be able to compute the transform type you have asked for (you did not show us which one.)
6 Comments
Soso
on 17 Mar 2015
Did you solve the problem? Please share with us what was the solution? Thank you so much.
See Also
Categories
Find more on Computer Vision with Simulink in Help Center and File Exchange
Products
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!