Python matplotlib bars overlapping although width < 1 -


i trying plot number of bar charts matplotlib having 26 timestamps / slots @ x-axis , 2 integers y-axis. data sets scales fine, in cases matplotlib lets bars overlap:

left overlapping , not aligned xticks, right 1 ok

overlapping

so instead of giving enough space bars overlapping although width set 0.1 , datasets have 26 values, checked.

my code plot these charts follows:

# plot rows = len(data_dict) // 2 + 1 fig = plt.figure(figsize=(15, 5*rows)) gs1 = gridspec.gridspec(rows, 2) grid_x = 0 grid_y = 0  dataset_name in data_dict:     message1_list = []     message2_list = []     ts_list = []     slot_list = []     slot, counts in data_dict[dataset_name].items():         slot_list.append(slot)         message1_list.append(counts["message1"])         message2_list.append(counts["message2"])         ts_list.append(counts["ts"])      ax = fig.add_subplot(gs1[grid_y, grid_x])      ax.set_title("activity: " + dataset_name, fontsize=24)     ax.set_xlabel("timestamps", fontsize=14)     ax.set_ylabel("number of messages", fontsize=14)      ax.xaxis_date()     hfmt = matplotdates.dateformatter('%d.%m,%h:%m')     ax.xaxis.set_major_formatter(hfmt)      ax.set_xticks(ts_list)     plt.setp(ax.get_xticklabels(), rotation=60, ha='right')     ax.tick_params(axis='x', pad=0.75, length=5.0)      rects = ax.bar(ts_list, message2_list, align='center', width=0.1)     rects2 = ax.bar(ts_list, message1_list, align='center', width=0.1, bottom=message2_list)      # update grid position     if (grid_x == 1):         grid_x = 0         grid_y += 1     else:         grid_x = 1   plt.tight_layout(0.01) plt.savefig(r"output_files\activity_barcharts.svg",bbox_inches='tight') plt.gcf().clear()

the input data looks follows (example of plot overlapping bars, second picture)

    slot - message1 - message2 - timestamp     0 - 0 - 42 - 2017-09-11 07:59:53.517000+00:00     1 - 0 - 4 - 2017-09-11 09:02:28.827875+00:00     2 - 0 - 0 - 2017-09-11 10:05:04.138750+00:00     3 - 0 - 0 - 2017-09-11 11:07:39.449625+00:00     4 - 0 - 0 - 2017-09-11 12:10:14.760500+00:00     5 - 0 - 0 - 2017-09-11 13:12:50.071375+00:00     6 - 0 - 13 - 2017-09-11 14:15:25.382250+00:00     7 - 0 - 0 - 2017-09-11 15:18:00.693125+00:00     8 - 0 - 0 - 2017-09-11 16:20:36.004000+00:00     9 - 0 - 0 - 2017-09-11 17:23:11.314875+00:00     10 - 0 - 0 - 2017-09-11 18:25:46.625750+00:00     11 - 0 - 0 - 2017-09-11 19:28:21.936625+00:00     12 - 0 - 0 - 2017-09-11 20:30:57.247500+00:00     13 - 0 - 0 - 2017-09-11 21:33:32.558375+00:00     14 - 0 - 0 - 2017-09-11 22:36:07.869250+00:00     15 - 0 - 0 - 2017-09-11 23:38:43.180125+00:00     16 - 0 - 0 - 2017-09-12 00:41:18.491000+00:00     17 - 0 - 0 - 2017-09-12 01:43:53.801875+00:00     18 - 0 - 0 - 2017-09-12 02:46:29.112750+00:00     19 - 0 - 0 - 2017-09-12 03:49:04.423625+00:00     20 - 0 - 0 - 2017-09-12 04:51:39.734500+00:00     21 - 0 - 0 - 2017-09-12 05:54:15.045375+00:00     22 - 0 - 0 - 2017-09-12 06:56:50.356250+00:00     23 - 0 - 0 - 2017-09-12 07:59:25.667125+00:00     24 - 0 - 20 - 2017-09-12 09:02:00.978000+00:00     25 - 0 - 0 - 2017-09-12 10:04:36.288875+00:00

does know how prevent happening? calculated 26 bars every chart , expected them have equally width. tried replace 0 1e-5, did not prevent overlapping (which post proposed).

the width of bar width in data units. i.e. if want have bar of width 1 minute, set width 

plt.bar(..., width=1./(24*60.))

because numeric axis unit datetime axes in matplotlib days , there 24*60 minutes in day.

for automatic determination of bar width, may want have bar width smallest difference between 2 successive values input time list. in case, following trick

import numpy np import matplotlib.pyplot plt import datetime import matplotlib.dates  t = [datetime.datetime(2017,9,12,8,i) in range(60)] x = np.random.rand(60)  td = np.diff(t).min() s1 = matplotlib.dates.date2num(datetime.datetime.now()) s2 = matplotlib.dates.date2num(datetime.datetime.now()+td)  plt.bar(t, x, width=s2-s1, ec="k")  plt.show()

enter image description here


Comments

Post a Comment

Popular posts from this blog

angular - Ionic slides - dynamically add slides before and after -

hi i'm using ngfor create set of 3 slides while starting in middle i'm guaranteed able slide left or right on start. when slide right can simple listen reachedend , push slide array i'm looping. but have problem adding slide beginning. if same above , use e.g. array.unshift() or spread add item beginning, view think it's on position 0 , snaps view new slide. the code below work animates slide change index 1. slide = [0,1,2] //example loop slidechanged(event) { if(this.slides.isbeginning()){ this.slide = [this.slide[0]-1, ...this.slide]; this.slides.update(); this.slides.slideto(1) } } <ion-slides [initialslide]="1" (ionslidedidchange)="slidechanged($event)"> <ion-slide *ngfor="let item of slide"> <h1>slide {{item}}</h1> </ion-slide> </ion-slides> any appreciated! you can using ionslidenextend , ionslideprevend events slides . please...
Read more

Add a dynamic header in angular 2 http provider -

i have http interceptor built via tutorial https://scotch.io/@kashyapmukkamala/using-http-interceptor-with-angular2 the problem need have dynamic header changes automatically once changes 'mode' in app. service able tell interceptor change header, or have interceptor pull header (which string)from service each request. able throwing away patch method, call http.patch('new header string') set header string. call in service controls 'mode' setting. wondering if there way interceptor pull recent value service each request or if can add method http provider via interceptor? i've tried call service in interceptor each request returns undefined. because creating new instance of service or copying value before service fired , loaded/changed data. i don't want pass header string every http provider call because defeats purpose of having interceptor, id able set once changes or have provider fetch service before makes request. tl;dr : need add autom...
Read more

minify - Minimizing css files -

i want know how css files can minimized. currently, using external sites css minifier compress css files. however, after removing whitespaces, comments, etc, file sizes reduced 10-15%. how frameworks bootstrap manage make minimized versions kilobytes. as example, css is: body { background-color: #ff0; } the reduction goes 28 bytes 22 bytes other css files have lot more characters still smaller this. actually minifying code means it's remove thing code white space characters new line characters comments block delimiters it reduces amount of code has transferred on web , speed site load fastly.but unreadable format.
Read more