Problem binning data with histc()

Hello,

I am trying to bin velocity and acceleration data using histc(). However, I am getting an error. I would be grateful if somebody could advise me on how to do it 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.

Ultimately, I trying to create a plot like this.

Thank you

Answer 1

[Walter Roberson]

histc() cannot histogram in 2 dimensions.

See http://www.mathworks.com/matlabcentral/fileexchange/9896-2d-histogram-calculation/content/hist2.m

[John]

Hello,

Thank you for your suggestions. Could I use hist3() instead?

edges = {-4:0.1:4, 0:120}
hist3(Data,'Edges',edges);

However, this code plots the data but does not return a variable telling me how much data is in each bin. Is there a way to get this information from the histogram?

Thank you

[Walter Roberson]

 N = hist3(Data, 'Edges', edges);

N would then be counts and nothing would be plotted.

[John]

Thank you for your help.

Answer 2

[Wayne King]

Why do you think you can use the syntax

histc(data,'Edges',edges)

that is not a supported syntax.

edges must be a vector or matrix. It is not a name-value pair as you have entered.

To do it correctly, something like

   Data = randn(1000,1);
   Edges = -3:0.5:3;
   N = histc(Data,Edges);