How to find particular number in the data vector?
4 次查看(过去 30 天)
显示 更早的评论
clc
clear all
close all
data = randi(100000)
% How can I find particular number like xx and at what positon in my data file?
1 个评论
Scott MacKenzie
2021-6-24
What do you mean by "data file"? You have one variable, data, and it contains one integer in the range 1 to 1000000.
回答(1 个)
dpb
2021-6-24
You've answered the question (sorta') with your tag referencing find -- but...(there's almost always a "but", isn't there!!?? ) :)
With integers, it's trivial --
[ifound,idx]=find(data,MyWantedInteger);
will return the value MyWantedInteger and the location (first if more than one) of that value in the data array. IFF, of course, the value of the integer you ask for is included in the random sample of values in the particular instantiation of the randomized variates. The above code just generates a single value in the range between 1 and 100000 so the chances of picking that particular number aren't good in the above.
You don't say, so perhaps the idea is the above is a randomized value to find in some other array -- same idea, just different place to look --
[ifound,idx]=find(TheOtherDataArray,data);
Same caveats are true, the particular value would have to exist in that other data file or the result will return an empty variable for ifound, not the valud data nor a location.
That's all simple-enough with integers, with floating point numbers, unless you can type in every digit in the number you're looking for to reproduce machine precision of the double array in which the data array is stored (and including rounding to match how the rand() function rounds, the chances are essentially nil you'll match anything -- in that case you'll want to look into ismembertol to find values within some range of an input value.
0 个评论
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 Logical 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!