# Automatically identify two numbers within an matrix

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Alberto Acri on 16 Feb 2023
Edited: Antonios Dougalis on 16 Feb 2023
Is there any way to automatically locate two numbers within a matrix?
For example:
• for the file "matrix_1.txt" I am interested in identifying the following numbers 194 (min) and 201 (max)
• for the file "matrix.txt" I am interested in identifying the following numbers 175 (min) and 199 (max)
So I am interested in a code that can identify these numbers without me knowing them. Like the max/min command that identifies the max/min within a matrix for example.
John D'Errico on 16 Feb 2023
You are not telling us enough information. You want to find a number, like the max and min, But they may not be the smallest or largest numbers in the matrix. In fact, they are not even close to that.
So apparently you know what you want, but cannot describe it. And the matrices you show are not at all clear in how you would decide on those specific values.

Voss on 16 Feb 2023
Edited: Voss on 16 Feb 2023
min_matrix = min(matrix(matrix >= 70))
min_matrix = 174
max_matrix = max(matrix(matrix >= 70))
max_matrix = 199
min_matrix_1 = min(matrix_1(matrix_1 >= 70))
min_matrix_1 = 194
max_matrix_1 = max(matrix_1(matrix_1 >= 70))
max_matrix_1 = 201

Mathieu NOE on 16 Feb 2023
Edited: Mathieu NOE on 16 Feb 2023
hello Alberto
welcome back !
here a demo for the 'matrix.txt' case
the other one is basically the same , simply change the min / max values
value_min = 175;
value_max = 199;
ind = find(M>=value_min & M<=value_max); % linear index
M(ind) % show the M values (to double check)
[r,c] = ind2sub(size(M),ind) % show corresponding row / col indexes

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