Find position of the values of an array in a second array

Question

raktim banerjee 2011-1-25

1
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There is 2 strings 'dls' & 'look'. I want to find exact lower and exact higher value of every elements of 'dls' in the sorted string 'look'. I wrote this:

dls = [5 2 1 7 4];
look = [-0.6 1 2.6 4.2 5.8 7.4];
s = length(dls);
l = length(look);
dlstr = 0;
dhstr = 0;
for i = 1:s,
    for j =1:l,
        if dls(i)>=look(j)
           continue; %j=j+1;
        else
            dh = look(j);
            dl = look(j-1);
            dlstr = [dlstr dl];
            dhstr = [dhstr dh];
            break;
        end
    end
end
dhstr(1)=[];
dlstr(1) = [];
dlstr
dhstr

The expected result is:

dlstr =
      4.2000    1.0000   -0.6000    5.8000    2.6000
>> dhstr
dhstr =
      5.8000    2.6000    1.0000    7.4000    4.2000

but the output is:

dlstr =
      4.2000    1.0000    1.0000    5.8000    2.6000
dhstr =
      5.8000    2.6000    2.6000    7.4000    4.2000

The problem occurred if any value in both strings match. '1' exists in both string. dlstr(3) should be -0.6000 & dhstr(3) should be 1.000. Please tell me how to overcome this problem?

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Paulo Silva 2011-1-25

"There is 2 strings 'dls' & 'look'"

I disagree, they look like arrays not strings

raktim banerjee 2011-1-25

Sorry sir! Yes, those are array.

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Answer 1

Ashish Uthama 2011-1-25

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在 MATLAB Online 中打开

With the above code, this correction should yield you your required output:

dls(i)>look(j)

You might be able to write this functionality more compactly by using the function find. Also: If you find the lower bound first, and the 'look' array is expected to be sorted, then wont the higher bound be the next element?