how to specify the particular column numbers of a matrix in for loop

I have a matrix withy dimension 1801 by 88. I want to select the column number 70:75 in for loop for analysis. If I start with

for i=1:1801

for j=1:5

It is only taking the first five columns. But I want get five columns having column number 70:75.

How can I do this.

Answer 1

[KSSV]

for i = 1:1801
    for j = 70:75

[AS]

I have given but it is not stored that values

[KSSV]

Show us the full code what you have tried.

[AS]

clc; clear all;
load ampli_512.dat;
load freq_512.dat;
load phase_512.dat;
for i=1:1801
    for j=70:75
             
        Am(i,j)=ampli_512(i,j);
        Ph(i,j)=phase_512(i,j);
        Ph1=Ph(:);
        Fq(i,j)=freq_512(i,j);
        Fq1=Fq(:);
        data=horzcat(Fq1,Am1,Ph1);
    end
end

[KSSV]

You need not to use a loop for this.

Am = ampli_512(:,70:75) ; 
Ph = phase_512(:,70:75) ; 
Fq = freq_512(:,70:75) ; 

data = [Am(:) Ph(:) Fq(:)] ; 

[AS]

If I want to do it in loop. then how it will be

[KSSV]

clc; clear all ;
load ampli_512.dat;
load freq_512.dat;
load phase_512.dat;

pos = 70:75 ; 
Am = zeros(1801,6) ; 
Ph = zeros(1801,6) ; 
Fq = zeros(1801,6) ; 

for i=1:1801
    for j=1:6             
        Am(i,j)=ampli_512(i,pos(j));
        Ph(i,j)=phase_512(i,pos(j));        
        Fq(i,j)=freq_512(i,pos(j));        
    end
end

[AS]

Thank you so much.