2017年9月30日土曜日

Multimeter


  • True-RMS:波形が歪んだACでも正確。#1,#2,#3,#4 が対応。Fluke 117はLoZ/NCVも装備(非接触検電)。Fluke

  • 安全規格(CAT):屋内配線・分電盤ならCAT III 600V以上を。Fluke 117はCAT III 600V。Hioki DT4255はCAT III/IV対応レンジ。Flukehioki.com

  • 屋外・タフさKeysight U1282AIP67・10ft落下耐性・60kカウントで現場最強クラス。Keysight+1

  • 精密据置:**Keithley 2100(6.5桁)**や B&K 2831E は研究/検証に最適。download.tek.combkprecision.comassets.testequity.com

  • まずは安価に:**AstroAI AM33D(2000カウント)**や ANENG AN8205C は入門用途に十分。astroai.comaneng.coAmazon

  • 日本ブランドHioki DT4282/DT4255 は応答が速く精度も高い定番。hioki.com+1

  • 作る/連携Bit Trade One USBマルチメータはRaspberry Piと連携でき、同時測定・ログ用途に便利。

目的別の短評

  • 家庭の電源/機器〜DIY:#1 Fluke 117(True-RMS+LoZ/NCVで“ゴースト電圧”回避)。Fluke

  • 電子工作の定番:#3 Hioki DT4255(True-RMSで基本を網羅、取り回し良し)。hioki.com

  • 屋外・設備保全:#4 Keysight U1282A(IP67・長時間駆動)。Keysight

  • ベンチ検証:#6 Keithley 2100(6.5桁・USB接続)、#5 B&K 2831E(手頃で多機能)。download.tek.comassets.testequity.com

  • 最安で一台:#9 AstroAI、#8 ANENG(導通・電圧・抵抗の基本学習に)。astroai.comaneng.co

Zentangle

ゼンタングルは、反復パターンを黒ペンで描き、集中と安らぎを得る“瞑想的ドローイング”手法です。

超簡単な始め方(5ステップ)

  1. 9cm角の紙に四隅へ点→枠線

  2. 鉛筆でゆるい「ストリング」(区切り線)

  3. 各エリアに模様(タングル)を描く

  4. 鉛筆で陰影→綿棒でぼかす

  5. 署名・日付

初心者向けタングル例
Crescent Moon/Hollibaugh/Printemps/Knightsbridge/Tipple

コツ
ゆっくり・失敗なしのマインドで/線幅と間隔を揃える/余白と陰影で立体感。

2017年9月10日日曜日

数値解析ソフト比較表


Creator Development started License Notes  
ADMB D. Fournier, ADMB Project Free BSD 3-clause (aka new) License Automatic differentiation makes it well suited to complex minimization problems
Analytica Lumina Decision Systems Free (Analytica Free 101), $995 (Professional), $2795 (Enterprise) Proprietary A numerical modeling environment with a declarative and visual programming language based on influence diagrams.
Ch SoftIntegration $399 (commercial) / $199 (academic) / Free (student) Proprietary C/C++ based numerical computing and graphical plotting[1]
DADiSP DSP Development $1995 (commercial) / $129 (academic) / Free (student) Proprietary Numeric computations for science and engineering featuring a spreadsheet like interface.
DataMelt S.Chekanov (jwork.org) Free Free for non-commercial use Mathematics, symbolic calculations, algebra, data analysis, data mining, interactive 2D/3D graphics, Java scriptable, used for science and engineering, Cross-platform (written in Java)
Dyalog APL Dyalog Ltd. £850/year or 2% royalty (free for non-commercial use) Proprietary A modern dialect of APL, enhanced with features for functional and object-oriented programming.
Euler Math Toolbox René Grothmann Free GPL Also a computer algebra system through interface with Maxima
Fityk Marcin Wojdyr $115 (1.x binaries) / Free (source code and 0.x binaries) GPL interactive graphics, scriptable, specialized in curve fitting and peak fitting, 2D only
FlexPro Weisang GmbH Not free (commercial) / Free (academic) Proprietary Dynamic, interactive 2D/3D diagrams, programmable, VBA, high performances, multicore compatible, large data sets.
FreeMat Samit Basu Free GPL Codeless interface to external CC++, and Fortran code. Mostly compatible with MATLAB.
GAUSS Aptech Systems Not free Proprietary  
GNU Data Language Marc Schellens Free GPL Aimed as a drop-in replacement for IDL/PV-WAVE
GNU Octave John W. Eaton Free GPL General numerical computing package with lots of extension modules. Syntax mostly compatible with MATLAB
IGOR Pro WaveMetrics $995 (commercial) $225 upgrade / $499 (academic) $175 upgrade / $85 (student) Proprietary interactive graphics, programmable, 2D/3D, used for science and engineering, large data sets.
J Jsoftware Free GPL online access to: J Application Library (JAL)
Julia Jeff Bezanson, Stefan Karpinski, Viral B. Shah, and other[3]contributors Free MIT License Direct calls of C functions (no wrappers needed). Designed for cloud parallel computing with LLVM JIT as a backend. Lightweight "green" threading (coroutines). Efficient support for Unicode. Shell-like capabilities for managing other processes. Lisp-like macros and other metaprogramming facilities.
LabVIEW National Instruments $1249 (commercial) / $79.95 (student) Proprietary Graphical, and textual through formula nodes, mathscript and .m file scripts[4]
Maple Maplesoft $2275 (commercial) / $99 (student) Proprietary Mainly a computer algebra system
Mathcad Parametric Technology Corporation $1195 (commercial) / $99 (student) Proprietary  
Mathematica Wolfram Research Free (Raspberry Pi[6]), $2495 (commercial) / $145 (student) / $295 (personal)[7] Proprietary Also computer algebra system
MATLAB MathWorks $2650 (standard) / $625 (education) Proprietary Numerical computation and simulation with extended 2D/3D visualization.
Maxima MIT Project MAC and Bill Schelter et al. Free GPL Mainly a computer algebra system
MLAB Civilized Software, Inc. $2250 (standard) / $50 (student) Proprietary Numerical and Statistical computation for Scientific Applications, e.g. Chemical Kinetics. ODE Solving and Curve-Fitting. Symbolic Differentiation, Survival Analysis, Cluster Analysis, 2D/3D Graphics.
Origin OriginLab $1095 (std.)/$1800 (Pro) Proprietary Integrated data analysis graphing software for science and engineering. Flexible multi-layer graphing framework. 2D, 3D and statistical graph types. Built-in digitizing tool. Analysis with auto recalculation and report generation. Built-in scripting and programming languages.
$550 (std., academic)
$850 (Pro, academic)
$69/yr. (Pro, student)
Perl Data Language Karl Glazebrook Free Artistic License Used for astrophysics, solar physics, oceanography, biophysics, and simulation. 2D plotting via PGPLOT, PLPlot bindings; 3D via GL.
PSPP Ben Pfaff Free GPL v.3 or later FOSS alternative to IBM SPSS. Analysis of sampled data, frequencies, cross-tabs comparison of means (t-tests and one-way ANOVA); linear regression, logistic regression, reliability (Cronbach's Alpha, not failure or Weibull), and re-ordering data, non-parametric tests, factor analysis, cluster analysis, principal components analysis, chi-square analysis and more
R R Foundation Free GPL Primarily for statistics, but there are many interfaces to open-source numerical software
SageMath William Stein Free GPL Programmable, includes computer algebra, 2D+3D plotting. Interfaces to many open-source and proprietary software. Web based interface HTTP or HTTPS
SAS Anthony Barrand James Goodnight Not free Proprietary  
SequenceL Texas Multicore Technologies Free (Community Edition), $2495 (Professional Edition) Proprietary Functional programming language and tools. Delivers high performance on multicore hardware with ease of programming, and code clarity/readability. Designed to work with other languages, including C, C++, C#, Java, Fortran, Python, etc. Can be compiled to multithreaded C++ (and optionally OpenCL) code with no explicit indications from the programmer of how or what to parallelize. A platform-specific runtime manages the threads safely.
S-Lang John E. Davis Free GPLArtistic License(1.x only) Available as a standalone (slsh) and embedded interpreter (jedslrn, ...)
Scilab Scilab EnterprisesWas:Inria Free CeCILLlicense Programmable, direct support of 2D+3D plotting. Interfaces to many other software packages. Interfacing to external modules written in C, Java, Python or other languages. Language syntax similar to MATLAB. Used for numerical computing in engineering and physics.
SPSS Normal H. Nie, Dale H. Bent, and C. Hadlai Hull Not free Proprietary  
Sysquake Calerga free / $2500 (Pro, commercial) / $1000 (Pro, academic) Proprietary interactive graphics
TK Solver Universal Technical Systems, Inc. $399 commercial / $49 (student) Proprietary Numerical computation and rule-based application development
VisSim Visual Solutions $495-$2800 (commercial) Proprietary Visual Language for simulation and Model Based Design. Used in business, science and engineering. Performs complex scalar or matrix based ODE solving with parametric optimization. Has 2D and 3D plotting, 3D animation, and state transition built in.
free view only version
$50-$250/free v3.0 (academic)
Yorick n/a Free GPL Programmable, callable 2D+3D plotting. Language syntax similar to C. Interfacing to other software packages via C calls.