python - matplotlib autoscale(axis='y') after slicing plot with set_xlim() -


as demonstration, i'm plotting x^0 through x^9 x values in range 10 20.

then i'm slicing images have 9 slices:

x = (10 11), (11 12) etc. (18 19)

i want images cropped y values spread top bottom in each slice, i'm getting autoscale scales full dataset rather current slice.

import matplotlib.pyplot plt import numpy np   # create test data in range(10):     x = np.arange(10,20)     y = x**i     plt.plot(x,y,c='red',marker='.',ms=2)  # x values in chart , reduce sorted list set xd = []  n in range(len(plt.gca().get_lines())):         line = plt.gca().get_lines()[n]         xd.append((line.get_xdata()).tolist()) xd = [item sublist in xd item in sublist] xd = sorted(list(set(xd)))  # attempt plot slices of x autoscaled y ax = plt.gca() in range(len(xd)-1):     ax.set_xlim([xd[i],xd[i+1]])     ax.axes.autoscale(enable=true,axis='y', tight=true)     plt.pause(1) #timing     #uncommenting next line create 9 tiny (6kb) image files     #plt.savefig(('image_%s.png' % i), bbox_inches=0, dpi=48)

in actual application, i'm attempting generate 100k tiny images in manner database stochastic data. every x there between 2 , 200 y values. i'm using opencv image match new images best fit amongst historical database.

its critical y values stretched top bottom in each image opencv find match.

if helps x values int() type , equally spaced

eta: i've attempted implement of solutions here have made no progress:

matplotlib - fixing x axis scale , autoscale y axis

matplotlib scale y axis based on manually zoomed x axis

but @ least i've learned:

autoscaling uses full range of data, y-axis scaled full extent of y-data, not what's within x-limits.

still no solution works here though

def autoscale_y()

presented @danhickstein

gives me:

h = np.max(y_displayed) - np.min(y_displayed) valueerror: zero-size array reduction operation maximum has no identity

from links, i'm unsure implement @joe kington's mask solution in loops.

i'm working @bernie solution proposed here y values given x:

how extract points graph?

maybe can set_ylim() given min , max y values @ x manually?

this easier if there way autoscale within defined xlim standard matplotlib method

i solved issue last night creating dictionary x's keys , respective list of y's values.

this occurs data created function y=x**i

in essence i'm creating dictionary structure pseudocode:

data[x0] = [x0y1,x0y2,x0y3....] data[x1] = [x1y1,x1y2,x1y3....] data[x2] = [x2y1,x2y2,x2y3....] etc.

i can later reference y values @ given x. there, find min , max y value left , right side of slice manually set ylim. if xlim slice more 1 x segment wide you'd have repeat process each respective x slice within xlim. in instance, x slices 1 segment wide.

import matplotlib.pyplot plt import numpy np  # move range function out of data creation loop x = np.arange(10,20,1)  # create dictionary of data x values keys data = {} in range(len(x)):    data[x[i]]=[]  # create test data in range(10):     y = x**i     plt.plot(x,y,c='red',marker='.',ms=2)      # store y data data dictionary created     xx = x[-len(y):]     j in range(len(xx)):         data[xx[j]].append(y[j])  # x values in chart , reduce sorted list set xd = []  n in range(len(plt.gca().get_lines())):         line = plt.gca().get_lines()[n]         xd.append((line.get_xdata()).tolist()) xd = [item sublist in xd item in sublist] xd = sorted(list(set(xd)))  # attempt plot slices of x autoscaled y ax = plt.gca() in range(len(xd)-1):     ax.set_xlim([xd[i],xd[i+1]])      # reference min , max y values left , right borders of x slice     ymin = min(min(data[xd[i]]), min(data[xd[i+1]]))     ymax = max(max(data[xd[i]]), max(data[xd[i+1]]))     # manually set y limits     ax.set_ylim([ymin,ymax])      #eliminate autoscale call     #ax.axes.autoscale(enable=true,axis='y', tight=true)     plt.pause(1) #timing

now when plots, y autoscaled x slice, not entire dataset.


Comments

Post a Comment

Popular posts from this blog

How to understand 2 main() functions after using uftrace to profile the C++ program? -

i trying uftrace profile following simple c++ program: #include <iostream> class { public: a() {std::cout << "a created" << std::endl;} ~a() {std::cout << "a destroyed" << std::endl;} }; int main() { a; return 0; } the profile result this: # uftrace a.out created destroyed # duration tid function 2.026 [ 4828] | __cxa_atexit(); [ 4828] | main() { [ 4828] | __static_initialization_and_destruction_0() { 89.397 [ 4828] | std::ios_base::init::init(); 0.768 [ 4828] | __cxa_atexit(); 93.029 [ 4828] | } /* __static_initialization_and_destruction_0 */ 94.425 [ 4828] | } /* main */ [ 4828] | main() { [ 4828] | a::a() { 11.104 [ 4828] | std::operator <<(); 10.825 [ 4828] | std::basic_ostream::operator <<(); 24.514 [ 4828] | } /* a::a */ [ 4828] | a::~a() { 0.978 [ 4828] | ...
Read more

c# - Update a combobox from a presenter (MVP) -

i using mvp in project, new in mvp. have 2 comboboxes. when select option in combobox, combobox should filled new data. this action in presenter. view 'view1' in presenter, , introduced combobox1 , combobox2 properties in 'view1', because need 'datasource', 'displaymember', 'valuemember' , 'refresh()' in method below. but, when using pattern, enough send property like public string combobox2 { { return combobox1.selectedvalue.tosstring(); } } into presenter not whole combobox. how can solve problem? public void onselectedindexchangedcombobox1() { if (view1.combobox1.selectedindex == -1) { return; } datatable dt = tools.getdatatable("a path"); var query = (from o in dt.asenumerable() o.field<string>("afield") == farmerview.combobox1.selectedvalue.tostring() orderby o.field<string>("anotherfield") select...
Read more

How to put a lock and transaction on table using spring 4 or above using jdbcTemplate and annotations like @Transactional? -

i trying put lock on table while writing on table , if happened in between roll-back . trying convert below code lock table test_g1 read; lock table test_g write; -- begin; start transaction; insert test_g1 values(143); insert test_g values(145); select * test_g1; select * test_g; rollback; select * test_g; unlock tables; how convert above code @transactional spring jdbctemplate code? @transactional(rollbackfor={dataaccessexception.class}) public void test(){ jdbctemplate.execute("insert test1 (id, nam) values (4, 'a')"); throw new dataaccessexception("error") { }; } here trying throw error, insert statement should rollback it's not happening . thanks edit-1 attaching code , doing in jdbcdaoimpl.java , mentioned problem comment above test() . app.java package com.cgiri.javabrains.spring4; import org.springframework.beans.factory.annotation.autowired; import org.springframework.context.applic...
Read more