17Choices Apps

This is a very simple and awesome FrequencyGenerator. It can generate sound frequencies from 1Hz to20,000Hz!The human can hear from 20Hz to 20,000Hz, you can use this tool totest your hearing.To use it, simply select the desired frequency using the sliderand turn On the sound by toggling the play switch!The user interface is very simple and clear!

Matrix Tools - Linear Algebra-- Matrix Operations --The Matrix Operations tool lets you do mathematical operations onmatrices. You can add, multiply or substract matrices veryeasily.The App will calculate the result only if your operation respectsMatrices properties (eg: in an addition, matrices must be the samesize).-- Matrix Analysis --The Matrix Analysis tool lets you have various information about amatrix. It calculates the determinant of the matrix, it gives youthe echelon form of the matrix (using Gauss-Jordan method), ittells you if the matrix is linearly independant or not and it givesyou the transposed matrix.-- Augmented Matrix --The Augmented Matrix tool lets you type and augmented matrix andsolves the system for you. For that, the tool echelonate the matrixand solves it.The augmented part of the matrix can be made of multiple columnswich can be realy helpful if you need to find the Change of BasisMatrix.-- Vector Operations --The Vector Operations tool lets you make operations on vectors,like addition, substraction, scalar product, vectorial product,vector projection and even get the angle between the vectors.If the operation is not possible (eg: vectorial product in base 4+)an error message will be shown.-- Vector Spaces --The Vector Spaces tool lets you analyse a vector space, get itBasis, it orthogonal basis (using Gram-Schmidt method), and get itorthonormal basis.

Stroboscopic Flash Ligh is an awesome App thatlets you make your phone Flash Light at desired frequencies. TheApp is simple and easy to use!You can easily adjust the frequency with the slider and you candeactivate the light with the ON/OFF Switch. A frequency of 0Hzwill give you a continuous Torch.

You never know when you need to check if anumber is a prime number or not!This handy app can tell you if any number is prime.It can calculate the primality of a number as big as you want, thelimit is the sky!Try it, here is a list of the 100 first prime numbers:2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61,67, 71,73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139,149, 151, 157, 163, 167, 173179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241,251, 257, 263, 269, 271, 277, 281283, 293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359, 367,373, 379, 383, 389, 397, 401, 409419, 421, 431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487,491, 499, 503, 509, 521, 523, 541You can also try bigger numbers. However for very big numbers,it may take time to calculate their primality!