ismembertol: What am I doing wrong?

x is attached. "Transparency" looks ok but "Lia" is all zero. Any idea what I'm doing wrong here?

Transparency = find (x>=0.9 | x<=0.8);
[Lia,~] = ismembertol (x, Transparency,1e-16);

Answer 1

[Steven Lord]

Based on your comment describing the problem you're trying to solve: "The idea is to make the elements that fall outside a range transparent. That's why there is OR. Bigger than a certain value, smaller than a certain value. You can pick any number. 4 and 6 are arbitrary." I think you've overcomplicated the problem. If all you want is a vector of true or false values depending on whether or not the values in x are in your range you need neither ismembertol nor find.

rng(6, 'twister') % Seed chosen so there are multiple elements in range
x = rand(10, 1); % Sample data

tooSmall = x <= 0.8;
tooLarge = x >= 0.9;
justRight = ~tooSmall & ~tooLarge;

Let's look at the results as a table.

t = table(x, tooSmall, tooLarge, justRight)

t = 10×4 table
       x        tooSmall    tooLarge    justRight
    ________    ________    ________    _________

     0.89286     false       false        true   
     0.33198     true        false        false  
     0.82123     false       false        true   
    0.041697     true        false        false  
     0.10766     true        false        false  
     0.59505     true        false        false  
     0.52982     true        false        false  
     0.41881     true        false        false  
     0.33541     true        false        false  
     0.62252     true        false        false  

If we were to use justRight to index into x, we'd get two elements.

x(justRight)

ans = 2×1

0.8929 0.8212

If we were to use tooSmall and tooLarge to index into x, we could get the other eight elements.

x(tooSmall | tooLarge)

ans = 8×1

0.3320 0.0417 0.1077 0.5951 0.5298 0.4188 0.3354 0.6225

[Pelajar UM]

I still wonder why ismember and find are not working consistently across different data sets but you are absolutely right. This method is far simpler and more robust too. Thanks a lot.

[Steven Lord]

In your original ismembertol call, you're asking for the intersection between raw data and indices of some of the values in the raw data. That doesn't make conceptual sense to me. I think that disconnect is the reason the behavior doesn't seem to be "working consistently".

Answer 2

[Arif Hoq]

try this:

x=readmatrix('x.txt');
Transparency = x(x>=0.9 | x<=0.8);
[Lia,~] = ismembertol (x, Transparency,1e-16)

Lia = 35526×1 logical array
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[Pelajar UM]

t=readmatrix('t.txt');
Transparency = t (t>=6 | t<=4);
[Lia,~] = ismembertol (t, Transparency,1e-16);

Thanks. It worked for x, but it doesn't work for t ("find" works for this one though).

I don't understand why...

[Arif Hoq]

first: your file name is x.txt, not t.txt

second: all the values of x.txt is less than 1, but your logical expression is less than 4 and greater than 6 which is out of range of x.txt.

so it would not work

[Pelajar UM]

I think you missed the new file. :)

t.txt is different from x.txt

[Arif Hoq]

i dont now about your expectation. I guess you trying to find the value x between 4 and 6, so try this

Transparency=t(t>=4 & t<=6)

[Pelajar UM]

The idea is to make the elements that fall outside a range transparent. That's why there is OR. Bigger than a certain value, smaller than a certain value. You can pick any number. 4 and 6 are arbitrary.

Answer 3

[Jan]

find() replies the indices of the non-zero elements. Indices are positive integers >= 1.

ismembertol(x, Transparency, 1e-16) searchs for elements of x, which are less than 1e-16 apart from any index stored in Transparency. None of the elements of x is close enough to 1, and 1 is the smallest possible value of Transparency. You have confused indices and the corresponding values.