matrix dimension mismatch in hist3 plot()

Hi,

I am using the code below to create a hist3 plot.

My question is, why is the variable z data a 405x605 matrix?

I thought it would be 81x121 as defined by the variable edges?

Thank you

edges = {-4:0.1:4, 0:1:120}
hist3(Data,'Edges',edges);
set(gcf,'renderer','opengl');
s = get(gca,'child');
zData = get(s,'zData');

Answer 1

[Walter Roberson]

hist3 creates patches to represent the data. Each patch has more than one coordinate tuple.

[John]

Oh I didn't realize that, thanks. How would I bin the data correctly?

I have velocity and acceleration in 2 columns. For example

Vel Acc

1   0.28
2   0.28
2   0.00
3   0.28
5   0.56
6   0.28

I am trying to bin the data into the bins, specified by the bin edges.

edges = {0:1:120, -4:0.1:4}

I was trying to use the histc(). Using the code:

n=histc(Data,'Edges',edges);

But I am getting the error:

Edge vector must be monotonically non-decreasing.

Could you tell me the correct way of defining the edges of the bins. I also tried a vector but that wouldn't work.

Thanks.

Notes: This thread is related to this thread

http://www.mathworks.co.uk/matlabcentral/answers/58681-specifying-bin-increments-on-a-histogram