find specific value from each row from matrix (Index, and number)

Hi All,

I am trying to find/obtain each value is lower than specific number from each row from a matrix. However I only obtain values from all the matrix.

Here is the code below:

I need to obtain only in each row if there is a number lower than 4 or not, I need both the index, and the real value

x=[1 2 3 4 5]
for i=1:5
   sigma1(i)=x(i)+1;
   sigma2(i)=x(i)+2;
   sigma3(i)=x(i)+3;
sigmaa(:,i)=[sigma1(i) sigma2(i) sigma3(i)]  
min_va=find(sigmaa>4); % I need to obtain only in each row if there is a number lower than 4 or not  
[r,c]=find(sigmaa>4)
end 

Any help please!

[Adam Danz]

That's a lot of lines to do a simple thing. Also, your comments state that you want to identify values less than 4 but your code is identifying values greater than 4.

Consider these two lines

x = [1 2 3 4 5]; %row vector
isLowerThan = (x + [1;2;3]) < 4;

The produce a logica matrix "isLowerThan" where each column corresponds to one value in "x" compared added to [1;2;3]. The '1's (true's) show where the results are less than 4.

Answer 1

[KALYAN ACHARJYA]

I need to obtain only in each row if there is a number lower than 4 or not, I need both the index, and the real value

X=magic(6);
[r c]=find(X<4);
idx=cell(1,length(r));
for i=1:length(r)
idx{i}={r(i),c(i)};
end
idx

Now read the values from X having idx indices (idx cell array, read individually)

[Ali Tawfik]

Thanks for your reply,

That's not what I need, I need for example, the values in the first row, which is lower than 4.

I need the numbers that;s in your example should be

1

3

2

and nothing in the last 3 rows.

thanks,

[Adam Danz]

That wasn't clear in your question. These lines below produce that output.

x = magic(6); 
x = x.'; 
x(x<4)