Histogram struggles (excluding low values and multiplying all the data)

Hi,

I’m trying to make histogram out of some data

lc = cellfun(@(c) c(end,6),particles);
hist(lc, 20)

How do I exclude values lower than 2 from the histogram? (as this back ground noise and looks messy)

ALSO - the data is current in the wrong units and I would convert it by multiplying by 7.431 (for example)

So to apply this to the data in the histogram would I do:

lc = cellfun(@(c) c(end,6),particles)
f=lc*7.431
hist(f,20)

Thanks in advance :)

Answer 1

[Image Analyst]

Use masking:

goodIndexes = particles >= 2;
histogram(particles(goodIndexes), 20);

particles is your data array.

[Saskia Davis]

Undefined operator '>=' for input arguments of
type 'cell'.

[Image Analyst]

Well then use whatever array has your data in it:

yourData = yourData >= 2;
histogram(particles(yourData), 20);

yourData would be a numerical array, like double or int32, not a cell array. http://matlab.wikia.com/wiki/FAQ#What_is_a_cell_array.3F

Extract yourData from the cell array if you have to. Maybe that's what lc is, so maybe you can use lc. I don't know what lc is - that's why I always use descriptive variable names.

[Saskia Davis]

Sorry, lc is cumulative length but I didn't explain and it worked the second time I used it for some reason! Thank you for your help :)