python - Plotting histrogram from numpy array -

-

i need create histograms 2d arrays obtain convolving input array , filter. bins should range of values in array.

i tried following example: how numpy.histogram() work? code this:

import matplotlib.pyplot plt import numpy np plt.hist(result, bins = (np.min(result), np.max(result),1)) plt.show()

i error message:

attributeerror: bins must increase monotonically.

thanks help.

what doing specifying 3 bins first bin np.min(result), second bin np.max(result) , third bin 1. need provide want bins located in histogram, , must in increasing order. guess want choose bins np.min(result) np.max(result). 1 seems bit odd, i'm going ignore it. also, want plot 1d histogram of values, yet input 2d. if you'd plot distribution of data on unique values in 1d, you'll need unravel 2d array when using np.histogram. use np.ravel that.

now, i'd refer np.linspace. can specify minimum , maximum value , many points want in between uniformly spaced. so:

bins = np.linspace(start, stop)

the default number of points in between start , stop 50, can override this:

bins = np.linspace(start, stop, num=100)

this means generate 100 points in between start , stop.

as such, try doing this:

import matplotlib.pyplot plt import numpy np num_bins = 100 # <-- change here - specify total number of bins histogram plt.hist(result.ravel(), bins=np.linspace(np.min(result), np.max(result), num=num_bins)) #<-- change here.  note use of ravel. plt.show()

Comments

Post a Comment

Popular posts from this blog

python - pip install -U PySide error -

-
does know how avoid following error when running pip install -u pyside per official website instructions here: https://pypi.python.org/pypi/pyside/#installing-pyside-on-a-mac-os-x-system note have done brew install qt successfully. you using pip version 7.0.3, version 7.1.2 available. should consider upgrading via 'pip install --upgrade pip' command. collecting pyside using cached pyside-1.2.4.tar.gz installing collected packages: pyside running setup.py install pyside complete output command /applications/anaconda/bin/python -c "import setuptools, tokenize;__file__='/private/var/folders/dy/ttgqhqqx3g9bsbsnqnxsk2z80000gq/t/pip-build-cpxemt/pyside/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/dy/ttgqhqqx3g9bsbsnqnxsk2z80000gq/t/pip-0r7hri-record/install-record.txt --single-version-externally-managed --compile: ...
Read more

arrays - C++ error: a brace-enclosed initializer is not allowed here before ‘{’ token -

-
simple question: i'm trying initialize array within c++ class declaration: using namespace std; #include <string> class myclass{ public: string myarray[] = {"a","b","c"}; }; and i'm getting error: error: brace-enclosed initializer not allowed here before ‘{’ token no, without complied c++11 compiler, cannot initialize member array in declaration. have initialize array member in constructor. , don't use open array if know number of elements initialize array.
Read more

cytoscape.js - How to add nodes to Dagre layout with Cytoscape -

-
i trying add nodes dagre graph through cityscape.js. problem nodes not painted. code have: cy.add({ group: "nodes", data: { id:"n0",name:"n0",weight: 75 }, }); $.ajax(url).done(function(jsontree){ var newnodes=[]; for(var i=1;i<6;i++){ //var child = jsontree.result[i]; newnodes.push( { group: "nodes", data: { id: "n"+i, name:"n"+i}}, { group: "edges", data: { id: "e"+i, source: "n0", target: "n"+i } } ); } cy.add(newnodes); any ideas? have used loaded function reload graph not work. not know if have use specific function reload graph. thank in advance. you need add positions new nodes. cytoscape.js docs : it important note positions of newly added nodes must defined when calling cy.add(). nodes can not placed in graph without valid position — otherwise not displayed. yo...
Read more