logical indexing between two varaibles

2015 4 28
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更新时间：2015 4 28
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I have these variables
i = i=3.02:0.00008:3.098;
j= 3.020005:0.00008:3.098005;
and a numerical array of 1000000x10. I want to determine in specific columns where the values of merged are between those of i and j, so in the first case I am trying to determine if the value is anything between 3.02 and 3.020005. I have tried some logical indexing where I used
index = (merged(merged(:,3) > i & merged(:,3) < j));
This however only seems to work if my numerical array is of the same dimensions as i and j which in this case would be 976x10. Any ideas how else to go about this to use logical indexing but with a numerical array of a larger size?

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Adam
Adam 2015-4-28
If you want to test each value against the respective value of i and j then how do you expect the logic to behave if your matrix is larger than i and j?
Guillaume
Guillaume 2015-4-28
编辑：Guillaume 2015-4-28
"where the value of are", you're missing a word there (possibly "merged").
"between those of i and j", i and j being a range of values, what does that mean exactly? Between the max of i and the min of j?
Rami Ahmad
Rami Ahmad 2015-4-28
I was trying to follow it from looking at between one set of values so I can simply write index = (merged(merged(:,3) > 3.02 & merged(:,3) < 3.020005)); which works fine. However I want to check between several values which is why I created i and j
Guillaume
Guillaume 2015-4-28
So do you want to compare merged to i(1) and j(1), then i(2) and j(2), and so on? What sort of output do you want? a logical array for each comparison?
Rami Ahmad
Rami Ahmad 2015-4-28
The idea of using the index approach is that if the value in merged is between i(1) and j(1) I will then have a logical array where I can then exclude the results that lie between these numbers. I don't need to know which ones meet the conditions for each value of i and j but the total logical array so I can say that I have checked between all of the respective values of i and j together and determined if any fall within those boundaries. Possibly indexing is not the best way to go about this, I'm not sure what is most suitable.
Jan
Jan 2015-4-28
I still do not understand, what you want to achieve. Could create a tiny example with inputs and the wanted output?

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回答（1 个）

pfb
pfb 2015-4-28

0 个投票

I'm not sure I understand your problem. It looks like some sort of binning problem.
You could try using "histc" on the columns of your matrix, using i or j (or a suitable combination thereof) to define the edges.

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Rami Ahmad
2015-4-28

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Jan
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2015-4-28

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