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

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Mo A 2021-6-21

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编辑： Mo A 2021-6-21

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?

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Answer 1

KALYAN ACHARJYA 2021-6-21

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编辑：KALYAN ACHARJYA 2021-6-21

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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)]

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Mo A 2021-6-21

编辑：Mo A 2021-6-21

在 MATLAB Online 中打开

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)]
 