Matlab does wired stuff

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bethel o 2011-2-21

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1723-matlab-does-wired-stuff

This is part of a function that is doing what i called wired. The vector 'dim_set' in this snippet should expanded on both side depending on the value of the scalar 'const'. I have no idea while the result is wired. Pls help!

 % expand dim_set by 1 or a const on each side
           dim_set=[67.5:100.5];
           const=20;
           dim_set %befor
           dim_set=floor(dim_set);
            if(dim_set(1)>1)
                dim_set=[dim_set(1)-const:dim_set(1),dim_set];
            end
            dim_set=[dim_set,dim_set(end):dim_set(end)+const];
           % See befoer and after values of dim_set to see this
           dim_set %after

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bethel o 2011-2-21

@Andreas Goser. i meant weird. I have been coding for stegers algorithm constantly for one week now, so am tired. And by the way is it 'ot weird' or 'or weird'?. lol there

Andreas Goser 2011-2-21

I noticed that :-) - can't edit the comments

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采纳的回答

Paulo Silva 2011-2-21

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https://ww2.mathworks.cn/matlabcentral/answers/1723-matlab-does-wired-stuff#answer_2546

在 MATLAB Online 中打开

dim_set=67.5:1:100.5
const=20;
dim_set %before
dim_set=floor(dim_set); %have no clue what's the purpose of this line
dim_set=[dim_set(1)-const:dim_set(1)-1 dim_set]; %expand left
dim_set=[dim_set dim_set(end)+1:dim_set(end)+const]; %expand right
% See before and after values of dim_set to see this
dim_set %after

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bethel o 2011-2-21

yep cheers that one is corrected. but the issue remains.

Paulo Silva 2011-2-21

You were correct, now that I know what your function does I came to the conclusion that the borders are irrelevant but there's no need to waste a little more memory with duplicated values.

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bethel o 2011-2-21

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1723-matlab-does-wired-stuff#answer_2547

在 MATLAB Online 中打开

   function tf=intersect_l(dim_set,memb)
           % expand dim_set by 1 or a const on each side
           %dim_set=[67.5:100.5];
           const=20;
           dim_set %befor
           dim_set=floor(dim_set);
            if(dim_set(1)>1)
                dim_set=[dim_set(1)-const:dim_set(1),dim_set];
            end
            dim_set=[dim_set,dim_set(end):dim_set(end)+const];
           dim_set %after 
            if(intersect(dim_set,memb))
                tf=1;
            else
                tf=0;
            end
        end

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bethel o 2011-2-21

Thanks a lot Paulo. I have also tried it and it works, outside of its parent function (because its a sub function). I have no idea why it dosn't work for certain values of 'const' when ran through the parent function but works for all values of 'const' when ran as a function on its own.

I will have a sleep and come back to it.

Thanks alot for your assistance.

Bethel

bethel o 2011-2-21

Hey Paulo, I did not realize that in programing if I have something like

IF(i && j), j will not be checked if i =false . this was simply the problem I was having. I was checking the output of j and only saw it some times (i and j are functions that returns boolean in my program). I did not know that the reason I was not seeing j sometimes was because sometimes i =false.

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