MathStudio Express vs iDroidSim

MathStudio Express, a full-featured scientific calculator with hundreds of mathematical functions that cover Basic Math, Pre-Algebra, Algebra, Trigonometry, Precalculus, Calculus, Statistics, Finite Math, Linear Algebra and Statistics. "MathStudio is a natural for students and for engineers who occasionally need a comprehensive math program but don't need the full horsepower and daunting complexity of Mathematica or Maple. It's a huge leap from the usual calculator program for tablets and smartphones." ▸ IEEE Spectrum Review by Kenneth R. Foster MathStudio is an indispensable tool for students, teachers, and engineers. It provides features comparable to TI calculators but with a modern and intuitive interface. "I've been waiting for a program like this a long time on my iPhone or iPad, and somehow never found MathStudio until now. This is a phenomenal engineering application for the student or professional. It does it all... Solving equations, integrating, calculating derivatives, and graphing. I had a TI-92 calculator back in my college days that I used for years and dearly loved and this app blows it out of the water. The UI is extremely functional and intuitive to use. They include a really quick tutorial that gets you up and running quickly. This is the example app for the potential of a device like the iPhone or iPad. Superb!" ▸ Fantastic... It's a TI-92 on steroids by Dan Frame Graph equations with speed and ease you never thought were possible! Move, rotate and pinch function, parametric, polar, implicit, contour, spherical, cylindrical, vector fields, fractals and image plots with amazing speed and accuracy. Use the T variable to create animated plots that graph in space and time! MathStudio is the first calculator to introduce time graphing when it was first released as SpaceTime in 2003 for Pocket PC. "This is truly an amazing piece of software for the iPhone that could potentially render all the graphing calculators out-there obsolete! I was very impressed with all the graphing features (2D, 3D, 4D, etc) and the powerful CAS loaded with preprogrammed functions. MathStudio solves and displays complex expressions in a fashion that reminds me of my TI 92's 'pretty print' mode. I highly recommend this application to every college student and math enthusiast!" ▸ Dump your graphing calculator! by Syldaril Plot lists of numerical data in scatter, histograms, box, and probability plots. MathStudio even includes an advanced regression analysis package, choose from several regression functions or create your own. "I am so lucky to find this application! I will never use TI-89 again! And the price is unbelievable! And you can do scripts! TI-89 costs over 100 dollars. You can use this application instead! Too bad our professor doesn't let us use phones on the test. I will try to convince him by showing this application. MathStudio is well worth the money." ▸ Wow! by aurorae_borealis MathStudio is powered by that fastest proprietary computer algebra system available on iOS that beautifully typesets your answers. Got a tough algebra equation to solve or polynomial to factor? Solve quadratic equations, systems of equations, limits, derivates, integrals, differential equations and much more. Create scripts in MathStudio's powerful programming language that supports variables, loops, and recursion. "This application is simply amazing. I continue to be stunned by the speed and accuracy in which it solves/plots/does just about anything you could possibly need to do in math. I prefer it to computer math applications because you simply cannot beat the touch interface. This app has changed the way that I do math every day, and I highly recommend it to anyone who does math on a daily basis." ▸ Amazing by rationalresponse

iDroidSim is a simple and powerful circuit simulator. Perfect for students new to electronics circuit design and construction, hobbyist and tinkerers and even seasoned professionals who want a quick, handy tool to perform electronics circuit design calculations. That's interactivity and innovation you can't find in best SPICE tools for PC. iDroidSim simulator solves basic resistive circuits using Kirchoff’s Current Law (KCL) in much the same way a student in a circuits class would,the simulator systematically forms a matrix in accordance with KCL and then proceeds to solve for the unknown quantities using various algebraic techniques such as Gaussian elimination and sparse matrix techniques. For non-linear components, such as the diode and BJT ,iDroidSim engine searching for the approximate solution by making an initial guess at an answer and then improving the solution with successive calculations built upon this guess. This is called an iterative process.iDroidSim simulation uses the Newton-Raphson iterative algorithm to solve circuits with non-linear I/V relationships. For reactive elements(capacitors and inductors),the iDroidSim uses numeric integration methods to approximate the state of the reactive elements as a function of time. iDroidSim offers the Trapezoidal(I'll add a GEAR method later) integration methods to approximate the state of the reactive elements. Although for most circuits, both methods will provide almost identical results, it is generally regarded that the Gear method is more stable, but trapezoidal method is faster and more accurate. iDroidSim for now can simulate: -Resistor -Capacitor -Inductor -Potentiometer -Light Bulb -Ideal operational amplifier -Bipolar junction transistor (NPN PNP) -MOSFET N-channel depletion -MOSFET N-channel enhancement -MOSFET P-channel depletion -MOSFET P-channel enhancement -JFET N and P -PN Diode -PN Led diode -PN Zener diode -AC current source -DC current source -AC voltage source -DC voltage(battery) source -CCVS - current controlled voltage source -CCCS - current controlled current source -VCVS - voltage controlled voltage source -VCCS - voltage controlled current source -Square wave voltage source -Triangle wave voltage source -AC ampermeter -DC ampermeter -AC voltmeter -DC voltmeter -Two channe oscilloscope -SPST Switch -SPDT Switch -Voltage controlled switch -Current controlled switch -AND -NAND -OR -NOR -NOT -XOR -XNOR -JK flip-flop -7 Segment Display -D flip-flop -Relay -IC 555 -Transformer -Graetz Circuit If you are making an oscillators you have to put a small initial value on some of the reactive elements.(see the examples)