Is there a way to automatically extract the first and last number in a for loop?

I'm working on a loop that automatically generates nodes and their coordinates. But I've simplified the code to this so it still works:

fid = fopen('hello.txt','w')
w = 100 
h = 100  
x1 = 30;    y1 = 5;

 for i= 1 : y1
     y = (i+1)/y1 * h
     for j= 1 :x1
         sd = i*x1 + j + 1
         x = (j+1)/x1 * w
         ns= ([sd,x,y,0.0])
        fprintf(fid,'%10d,%10f,%10f,%10f\n', ns)
     end 
 end 
 
%First, Last , First

So my question is, is there a way to automatically extract the first and last number in the sd column and place them in a format like: First, Last, First. Even if the numbers assigned to the variables at the top changes?

Answer 1

[KALYAN ACHARJYA]

So my question is, is there a way to automatically extract the first and last number in the sd column and place them-

Just store the sd as array

sd=zeros(1,length(x1));
for 
for loop
sd(j)=
end 
end 

First Array Element

sd(1)

& Last Array Element

sd(end)

Set the format as per the requirements

%[first,last,...]
data=[sd(1),sd(end)]

[Mo A]

Hi Kalyan, thank you for your answer. I've tried running the code with the ones you've provided but its not giving me the exact values for the first and last array element.

w = 100 
h = 100  
x1 = 30;    y1 = 5;
 sd =zeros(1,length(x1));
 for i= 1 : y1
     y = (i+1)/y1 * h
     for j= 1 :x1
         sd(j) = i*x1 + j + 1
         x = (sd(j)+1)/x1 * w
         ns= ([sd(j),x,y,0.0])
        fprintf(fid,'%10d,%10f,%10f,%10f\n', ns)
     end 
 end 
 
 data=[sd(1),sd(end)]
 

I'm not sure why that is?