how to find a non affected rank in a vector column
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Dear matlab users,
in order to make lghter my script I treat the format of the legend of several plots in a dedicated zone of my script
figure(1); plot(x,y); h_leg(1) = legend('plot1')
...
figure(2); plot(x,y); h_leg(2) = legend('plot2')
...
figure(4); plot(x,y); h_leg(4) = legend('plot4')
...
%% overall treatment of the various legends
for j=1:4; set(h_leg(j),fontsize,12); end
here, the issue is that h_leg(3) does not exist and the last loop will fail in dealing with h_leg.
is there any mean to check that this class of object has some rank left undefined? A kind of isempty(h_leg(3)) for example
Thanks for your help
Cheers
0 件のコメント
採用された回答
dpb
2019 年 4 月 30 日
Probably for such a case as written
for j=1:4
try
set(h_leg(j),fontsize,12);
catch
end
end
will solve the problem; if you're out to optimize,
set(h_leg([1 2 4]),'fontsize',12)
altho the subscript vector should be coded dynamically instead of hardcoded (as should the loop be over 1:numel(h_leg) instead of 1:4)
What is the type of h_leg()?
2 件のコメント
dpb
2019 年 5 月 2 日
編集済み: dpb
2019 年 5 月 2 日
I don't know that try...catch is any "heavier" than coding specifically to test whether every handle in the array of objects is a legend--the only way I can see to do that is to test strcmp(h_leg(i).Type,'legend') and it will also fail on the uninitialized object placeholder locations so would still have to either catch the error or do some other preliminary test.
I think it would be better to rearrange the code logic to either set the legend text property for those lines when they're being created or at least build the addressing array to them at that point instead.
AFAICT, there is no specific functionality provided to return a logical variable that a graphics placeholder array element is, as yet, unitiialized. That could, it seems, be a reasonable enhancement request.
I'll admit I've used gobject "in anger" precisely zero times to date so I'm far from adept in knowing what one can/cannot do with it; my penchant is to keep graphics handles in arrays of the specific type when the object(s) is/are created rather than in some catchall grab bag.
その他の回答 (2 件)
Walter Roberson
2019 年 4 月 30 日
You can use isvalid() or ishghandle()
set(h_leg(isvalid(h_leg(1:4))), 'fontsize', 12);
No loop needed. If h_leg is maximum size 4 then leave out the (1:4)
4 件のコメント
Walter Roberson
2019 年 5 月 2 日
Frederic Cleva comments to me:
This makes the job too (ishghandle) !! Thanks
dpb
2019 年 5 月 2 日
Indeed...either it or isgraphics turns out to return False for the uninitialized graphics object array elements -- I hadn't found either; the doc links are quite remiss at least on R2017b that is presently latest installed here (R2018b having mysteriously disappeared and not having had time to dig into why/reinstalling)...
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