np-by-2 array

How to create np-by-2 array ?

I found matlab code related to chain code. and in that code author used np-by-2 array as a input of the function.

So. pls help me... Thanks in advance...

[Azzi Abdelmalek]

What is your problem?

[Shivang Patel]

I can't understanding meaning of "np-by-2 array"... !

if i have image(30x40), then how i create this np-by-2 array ?

Sorry, Maybe it's a easy question... but i have very less experience with matlab...

[dpb]

Well, an "npx2 array" simply means an array of np rows by 2 columns.

Now what that array is supposed to be or represent we've no way of knowing; that's totally dependent upon the use the author of the code you've found has prescribed for it.

Simply "making" a npx2 array is as simple as

np=5; % say 5 rows
MyNPby2Array=rand(np,2);  % create a 5x2 array of random values

You'll have to read the documentation supplied by or contact the author for the subject code you're trying to use to understand the specifics of that particular application.

[Shivang Patel]

ok... thank you...

Answer 1

[Image Analyst]

np probably means "number of points". There are np rows - one row for each point. And two columns. The first column is probably either the x coordinate, or the row of the image. The second column is either the y value, or the column of the matrix. Not sure how they specified it - what they are expecting. Make sure you don't make the common mistake of mixing up row, column with x,y. Remember row,column is y,x NOT x,y.

[Image Analyst]

By the way, my chain code demo is attached.

[Shivang Patel]

Thanks for your code... I will explore it and try to understand it.

[Lluis Roca]

Is there a way how to draw back the chain code?

[Image Analyst]

Not sure what "draw back" means.

[Lluis Roca]

"draw back" - use a chain code to draw the original object outline