how to use find command to find numbers?

Question

Andy 2012-4-2

评论： the cyclist 2016-2-20

so say if i have

a=[1;2;3;4;5;6;7;8;9]

and i want to find which position the number 5 is.

so i tried to use

position = find (a,5)

but it gives me back a whole bunch of numbers. so how do i use the find command? thanks

Answer 1

the cyclist 2012-4-2

You want

position = find(a==5);

Your example is maybe not the best, since the position and the value are the same in every case, but just to be clear on what you mean:

x = [2 5 7 4 3];
position = find(x==5)

will return position = 2, because 5 is in the 2nd position in x.

FYI, in the syntax you used in your example, MATLAB was returning the positions of the first 5 non-zero entries of a.

Rohit Bhoi 2016-2-19

then how to use find function to find value in particular row of excel sheet

the cyclist 2016-2-20

(You might want to open a new question, rather than commenting on a 4-year-old question.)

First you need to load the data from Excel. You can do this with the xlsread command. Then you can use find as described here.