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Function minimization - beat fminsearch!
Sequel of problem 45948 <https://www.mathworks.com/matlabcentral/cody/problems/45948-function-minimization-beat-fminbnd> M...

etwa ein Monat vor

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Function minimization - beat fminbnd!
Matlab's fminbnd function finds a minimizer of a function within an interval. If often gets stuck in local minima. Can you do...

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Bounding Circle
The Bounding Circle is the smallest enclosing circle to a given set of points on a plane <https://en.wikipedia.org/wiki/Smallest...

etwa ein Monat vor

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Least Absolute Deviations (L1-norm) line fit - degree n
This is a generalization of Problem 45851 for degree n <https://www.mathworks.com/matlabcentral/cody/problems/45851-least-abs...

etwa ein Monat vor

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Least Absolute Deviations (L1-norm) line fit - degree 1
Matlab's polyfit function is very handy to find least-squares regression. It minimizes the (L2-norm) of the estimation errors, b...

etwa ein Monat vor

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What is the current time in Darwin, Australia?
Traders need to track exchange calendars and trading hours in detail, and account for time zone differences and daylight savings...

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Convert vector datasets to plot with imagesc instead of scatter
For large datasets this allows much faster plotting. An irregular 2D spatial sampling is provided in x and y vectors with a d...

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Magic Concentric Circles
Consider 4 magic circle circles around a single number in the sequence 1:n where the sum along the diameters is always equal, an...

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Key Generation for Solitaire Cipher
The Solitaire Cipher by Bruce Schneier was introduced to Cody in two problems by Doug Hull: http://www.mathworks.com/matlabcent...

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Borderline Connectivity
Compute the connected components of pixel borders. Suppose that h and v together describe a logical labeling of the borders b...

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Approximate the inverse tangent by power series
Given values b (where abs(b)<=1) and n (polynomial order), write a function that calculates atan(b) by using power series.

etwa ein Monat vor

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"Bubblegum, Bubblegum, in a dish; How many pieces do you wish?"
The child's game "bubblegum, bubblegum, in a dish; how many pieces do you wish?" is a way of eliminating players until a single ...

etwa ein Monat vor

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Complete a 2nd order difference sequence
In Cody Problem 59791 ChrisR asks us to find the integer that completes a randomly sorted geometric sequence with one missing el...

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increasing sequences
Given a string of digits, insert commas to create a sequence of strictly increasing numbers so as to minimize the magnitude of t...

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Find the particular dividend
It is known that once you write the sequence 10101...101 long enough, the number will be finally divisible by any odd number if ...

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factorial
There are really some cody problems related to factorial of n, e.g., 42667, 45184, 46054, and etc. It is interesting to ask why ...

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three digits
Input three digits no larger than 4，say 1,2 and 3, write the possible largest number composed（concatenation and power） only by t...

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prime consecutive sums
Create a number sequence of 1 to n, such that the sums of every two consecutive numbers are all primes. E.g. if n = 5, you may ...

etwa ein Monat vor

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how to concatenate matrices
What is the name of the function used to create a matrix C form two matrices A and B, using the syntax: C = [A B]; Outpu...

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Persistence will not help you solve this problem.
Create a function without inputs that adds one to the output every time it is called. A different possibility of solving this ha...

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Hilbert Scan Algorithm
As Zig-Zag and Horizontal ... we have also a < <Hilbert> <Scan> > as shown in this article <http://link.springer.com/chapter/10....

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Stop a ZigZag scanning N*N Matrix at any diag you want
Suppose that we have a 2-D matrix and we try to obtain a 1-D array in zig-zag order, but not all values of our 2-D matrix e...

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Adaptive ZigZag
Unfold a 2-D matrix to a 1-D array in Adaptive zig-zag order, e.g., for matrix [ 1 2 5 6; 3 4 7 8; 9 10 13 14; ...

etwa ein Monat vor

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Create a 3D rotation matrix from roll-pitch-yaw angles
Consider a robotics application where the world reference coordinate frame {W} and a robot manipulator arm with an attached tool...

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Orientation of a 3D coordinate frame
The orientation of a body-fixed frame {B} with respect to the world frame {W} is described by an SO(3) rotation matrix. Compute...

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Determine roll pitch yaw angles from a 3D rotation matrix
Consider an aerospace application where the world reference coordinate frame {W} and a body-fixed coordinate frame {B}. The ori...

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Homogeneous lines and points in 2D: problem 1
In high school we learn the line equation y = mx + c where m is the gradient and c is the intercept. However this form is proble...

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Upstairs!
The stair has n steps. Every times you can up one or two steps. Give all the different solutions to upstairs. For example n ...

etwa ein Monat vor

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Successive zeros (harder)
The problem is from Problem 45436, <https://www.mathworks.com/matlabcentral/cody/problems/45436-successive-zeros> Suppose n i...

etwa ein Monat vor

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Solve Sudoku puzzle step by
Sudoku is a famous puzzle. <https://en.wikipedia.org/wiki/Sudoku> Give a standard sudoku by a matrix (9*9), You need give a ...

etwa ein Monat vor

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