Python Optimization and Bizarre Output Responses -


i have 2 small issues regarding code in python 2.7, , see input on these issues:

lesser issue: i've been testing python 2.7 script designed output degree heading after given distance traveled around ellipse. however, need program run within 15 seconds full extent. currently, program outputs 31.1410000324 seconds completion isn't terrible considering possible me divide sample size little less half.

main issue: however, here other problem: @ 3 specific points in program, result being output not correct. 1 time outputs 18.47700786, , other 2 output 37.90802974. why happening? when run 3 of them normally, output correct values, @ full speed, appear give strange values though values consistent every time. know think.

here script:

import numpy np scipy.integrate import quad scipy.optimize import minimize import time = 2; b = 1 dx = lambda t: -a * np.sin(t) dy = lambda t: b * np.cos(t)  encoderdistance = 0.00001 def func(x): return np.sqrt(dx(x)**2 + dy(x)**2) time1 = time.time() in range(2423):     r_angle = (((180/np.pi) * np.arctan(((np.tan(minimize(lambda x:                   abs(quad(func, 0, x)[0] - encoderdistance), 1).x))*b)/a)))     print r_angle[0]     encoderdistance += 0.001 time2 = time.time() print time2-time1, "seconds completion"

and here graph of output code: code graph


Comments

Post a Comment

Popular posts from this blog

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m...
Read more

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

sql server - Why does Linq-to-SQL add unnecessary COUNT()? -

here tables: create table customer ( cid int primary key, name varchar(32) ) create table ord ( oid int primary key, cid int foreign key references customer, address varchar(20) ) here's linq-to-sql statement: var aaa = c in db.customer select new { c, o = c.ord.tolist() }; and here's inexplicable query generated linq-to-sql: select [t0].[cid] [cid], [t0].[name] [name], [t1].[oid] [oid], [t1].[cid] [cid2], [t1].[address] [address], (select count(*) [dbo].[ord] [t2] [t2].[cid] = [t0].[cid]) [value] [dbo].[customer] [t0] left outer join [dbo].[ord] [t1] on [t1].[cid] = [t0].[cid] order [t0].[cid], [t1].[oid] i want understand how rid of count(*) part. it's entirely uncalled for! linq needs count(*) in order determine number of entries returned o = c.ord.tolist() .
Read more