result of ismember is wrong in my code correct in command window

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nadia nadi 2015-12-3

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编辑： Stephen23 2015-12-5

Dear, I have this code, when I get the result from the loop I find the common rows between pp and pointsout but I got wrong result, when I copy my matrix pp and pointsout to command window or I comment my code and tried from file it gives correct answer. for example

pp =[
   29.6360   20.2328   25.8546
   22.0039   27.8829   29.8251
   23.3343   26.8422   20.0174
   20.1460   29.4970   29.2674
   27.7054   29.9161   24.0945
   29.9539   27.4832   29.3899];
pout=[];
pin=[];
points=pp;
for k=1:size(pp,1)
[ClosestPoint,Distance] = Cl(XYZ,pp(k,:));
if Distance ==-2 
 pin=[pin; pp(k,:)]
end
pout=[pout; ClosestPoint];
end
pointsout=[pointsin; pout];
% find the index of the in points
idx=ismember(pointsout ,points,'rows')

pointsout =[
6612   39.8834   33.3147
2505   41.9976   32.2839
6122   41.9067   32.3282
0877   42.5413   32.0188
4130   40.9513   32.7941
6676   40.1332   33.1929];

it gives me just five rows by ismemebr, when I take the two matrices and check in the command window I get 6 rows even when I comment the code to check. What is wrong of the code, why it effect the result. I'm sorry I can't write the whole code for respect to function Cl its 4 files. Thanks for any comments and help.

Nadia,

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采纳的回答

James Tursa 2015-12-3

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https://ww2.mathworks.cn/matlabcentral/answers/258745-result-of-ismember-is-wrong-in-my-code-correct-in-command-window#answer_202092

I suspect this is just floating point issues. Reading from a file may read in all of the precision of the numbers (i.e., precision beyond the 4 digits after the decimal point you are showing). But setting the numbers directly from the command line as in your code above may give you slightly different results. I suggest you check and compare the pp and pointsout etc you get from the various methods you are using to see if there are any differences.