# how to store a value in the next row?

4 views (last 30 days)
VENGATESAN S on 3 Sep 2020
Edited: Stephen23 on 4 Sep 2020
i want to extract the coordinates for a squar plate having length of 1m. i want to divide into 25 smaller square whose lenth is 0.2. so that i will get an array of (25,2).
x1=0; x2=1;
y1=0; y2=1;
del=0.2;
step=zeros(25,2);
for y=y1:del:y2;
for x=x1:del:x2;
step=[x y]
end
end
what i am getting from this program is
step =
0 0
step =
0.2000 0
step =
.4000 0
step =
0.6000 0
.............................
step =
1 1
what im actually want is
step= 0 0
0 0.2
0 0.4
. .
. .
1 1
i want to store the value in the next row for the next loop.

Stephen23 on 3 Sep 2020
Edited: Stephen23 on 3 Sep 2020
The MATLAB approach:
>> [X,Y] = ndgrid(0:0.2:1);
>> M = [Y(:),X(:)]
M =
0.00000 0.00000
0.00000 0.20000
0.00000 0.40000
0.00000 0.60000
0.00000 0.80000
0.00000 1.00000
0.20000 0.00000
0.20000 0.20000
0.20000 0.40000
0.20000 0.60000
0.20000 0.80000
0.20000 1.00000
0.40000 0.00000
0.40000 0.20000
0.40000 0.40000
0.40000 0.60000
0.40000 0.80000
0.40000 1.00000
0.60000 0.00000
0.60000 0.20000
0.60000 0.40000
0.60000 0.60000
0.60000 0.80000
0.60000 1.00000
0.80000 0.00000
0.80000 0.20000
0.80000 0.40000
0.80000 0.60000
0.80000 0.80000
0.80000 1.00000
1.00000 0.00000
1.00000 0.20000
1.00000 0.40000
1.00000 0.60000
1.00000 0.80000
1.00000 1.00000
##### 3 CommentsShow 1 older commentHide 1 older comment
Stephen23 on 4 Sep 2020
Edited: Stephen23 on 4 Sep 2020
"but it shows ...Error: Invalid use of operator."
Lets have a look:
>> [X,Y] = ndgrid(0:0.2:1);
>> M = [Y(:),X(:)] % my code (no spaces, no error)
M =
0 0
0 0.2000
... more lines here
1.0000 0.6000
1.0000 0.8000
1.0000 1.0000
>> M = [Y (:),X (:)] % your code (add spaces -> error)
M = [Y (:),X (:)]
Error: Unexpected MATLAB operator.
>>
VENGATESAN S on 4 Sep 2020
thanks for your support..now it is working

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