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Why does this loop create a horizontal array instead of a vertical array?

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Red Beard
Red Beard 2012-10-23
I know this may seem a really simple question but I just can't seem to work this one out when consulting the manual.
Within my code I have the following loop to work out the difference between sensor readings:
for i = 1 : size(xVal)
df([i]) = yVal(i+1) - yVal(i);
End
xVal is a line number and yVal is a sensor reading.
But for some reason, rather than creating a vertical array of difference values, a horizontal array is created and before it is complete MATLAB throws up an error stating "Index exceeds matrix dimensions" (I assume this error is because the horizontal array goes beyond a value MATLAB can handle.)
How can I change this loop so that a vertical array is created? (I also assume that this would overcome the "Index exceeds matrix dimensions" error?)
Any help is greatly appreciated.

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采纳的回答

Alexandra
Alexandra 2012-10-23
Why don't you try it with the function diff? It's easier and very quickly...
  2 个评论
Alexandra
Alexandra 2012-10-23
Also you have to put the right dimension when you use size function, especially on a for
for i = 1 : size(xVal,1) % -> Rows
Red Beard
Red Beard 2012-10-23
This is exactly what I have been looking for. I couldn't find this function in the manual!!!
Thank you.

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更多回答（1 个）

Sachin Ganjare
Sachin Ganjare 2012-10-23
Probably you have preallocated array df as maybe zeros(x,1). It should be:
df = zeros(1,x);
x is number of elements in array df
Hope it helps!!!

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