# how to identify rows and columns of a random array with a undetermind amont of rows or colloms

4 views (last 30 days)
fred brunn on 10 Feb 2015
Edited: fred brunn on 10 Feb 2015
_______BEGINING OF CODE___________________
n=0
while n<5 || n>25
if n<5 || n>25
disp('the value isnt vaild,try again');
end
end
array=round(100*rand(n,n))
total_sum=0;
________END OF CODE________________
so basically if I wanted to find the sum of say row 2, how can I declare row 2 as B? so that row "n" can be the equivalent of its place in the alphabet.. example Row1=a Row2=b Row3=c exc... and column1=aa column2=bb exc..

Hikaru on 10 Feb 2015
I'm just stating my opinion here. But, do you really need to name the rows and columns as specific variables? Isn't it more efficient to just use the index? For example, if you want the user to input which row they are interested in finding the sum of, then:
sum(array(k,:)) % where k is any number indicating the row

fred brunn on 10 Feb 2015
Edited: fred brunn on 10 Feb 2015
___CODE_____
clc;
clear;
n=0
while n<5 n>25
if n<5 || n>25
disp('the value isnt vaild,try again');
end
end array=round(100*rand(n,n))
%find the sum to any row row_number=input('to find the sum of any row please enter a row number') ROW_SUM=sum(array(row_number,:)) fprintf('sum of row selected is---%f\n',ROW_SUM)
%find the collum to any row collum_number=input('to find the sum of any collum please enter a row number') COLLUM_SUM=sum(array(:,collum_number)) fprintf('sum of row selected is---%f\n',COLLUM_SUM)
___________END_______________
worked great thanks for the advice :)

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