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# Z Liang

26 total contributions since 2019

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Question

Understanding the update equation in logistic regression/classifier
Following a tutorial, I tried implementing the steps of building a logistic classifier below %% logistic regression tutorial; h...

3 months ago | 0 answers | 0

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Question

Move on to next iteration when condition is satisfied, specifically when using functions
for i1 = 1:10 [out1,out2] = func1(in1,in2) % in1 is file name for 10 files in directory end func1 analyzes some files wh...

4 months ago | 2 answers | 0

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Question

Cannot load default file for CWT
I have R2019a with several toolboxes >> ver ----------------------------------------------------------------------------------...

5 months ago | 1 answer | 0

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Question

How to search for the optimal parameters of a filter
ep_mean is a 26xN matrix of a single trial, recorded through 26 electrodes, over N time points (roughly 220 points sampled) I a...

6 months ago | 1 answer | 0

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Question

How to extract only numerical values from cell into new column array?
For this data: "chb12_06.edf" "1665 seconds" "1726 seconds" "3415 seconds" "3447 seconds" "chb12_08.edf" "1426 seconds" ...

6 months ago | 2 answers | 0

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Question

Subtracting string/character values in cell arrays
This is a portion of a cell array A, columns 2:5 are trials 1:4 I believe each cell has a character/string, i.e. A{1,3} = 'F7...

7 months ago | 0 answers | 0

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Solved

Summing digits
Given n, find the sum of the digits that make up 2^n. Example: Input n = 7 Output b = 11 since 2^7 = 128, and 1 + ...

7 months ago

Solved

Swap the first and last columns
Flip the outermost columns of matrix A, so that the first column becomes the last and the last column becomes the first. All oth...

7 months ago

Solved

Bullseye Matrix
Given n (always odd), return output a that has concentric rings of the numbers 1 through (n+1)/2 around the center point. Exampl...

7 months ago

Solved

Find all elements less than 0 or greater than 10 and replace them with NaN
Given an input vector x, find all elements of x less than 0 or greater than 10 and replace them with NaN. Example: Input ...

7 months ago

Solved

Return the largest number that is adjacent to a zero
This example comes from Steve Eddins' blog: <http://blogs.mathworks.com/steve/2009/05/27/learning-lessons-from-a-one-liner/ Lear...

7 months ago

Solved

Find the longest sequence of 1's in a binary sequence.
Given a string such as s = '011110010000000100010111' find the length of the longest string of consecutive 1's. In this examp...

7 months ago

Solved

Find the numeric mean of the prime numbers in a matrix.
There will always be at least one prime in the matrix. Example: Input in = [ 8 3 5 9 ] Output out is 4...

7 months ago

Solved

Remove all the consonants
Remove all the consonants in the given phrase. Example: Input s1 = 'Jack and Jill went up the hill'; Output s2 is 'a ...

7 months ago

Solved

Fibonacci sequence
Calculate the nth Fibonacci number. Given n, return f where f = fib(n) and f(1) = 1, f(2) = 1, f(3) = 2, ... Examples: Inpu...

7 months ago

Solved

Back and Forth Rows
Given a number n, create an n-by-n matrix in which the integers from 1 to n^2 wind back and forth along the rows as shown in the...

7 months ago

Solved

Determine whether a vector is monotonically increasing
Return true if the elements of the input vector increase monotonically (i.e. each element is larger than the previous). Return f...

7 months ago

Solved

Who Has the Most Change?
You have a matrix for which each row is a person and the columns represent the number of quarters, nickels, dimes, and pennies t...

7 months ago

Solved

Given a and b, return the sum a+b in c.

7 months ago

Solved

Column Removal
Remove the nth column from input matrix A and return the resulting matrix in output B. So if A = [1 2 3; 4 5 6]; ...

7 months ago

Solved

Select every other element of a vector
Write a function which returns every other element of the vector passed in. That is, it returns the all odd-numbered elements, s...

7 months ago

Solved

Triangle Numbers
Triangle numbers are the sums of successive integers. So 6 is a triangle number because 6 = 1 + 2 + 3 which can be displa...

7 months ago

Solved

Make a checkerboard matrix
Given an integer n, make an n-by-n matrix made up of alternating ones and zeros as shown below. The a(1,1) should be 1. Examp...

7 months ago

Solved

Find the sum of all the numbers of the input vector
Find the sum of all the numbers of the input vector x. Examples: Input x = [1 2 3 5] Output y is 11 Input x ...

7 months ago

Solved

Make the vector [1 2 3 4 5 6 7 8 9 10]
In MATLAB, you create a vector by enclosing the elements in square brackets like so: x = [1 2 3 4] Commas are optional, s...

7 months ago

Solved

Times 2 - START HERE
Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

7 months ago