# Neuropragmatist

### University College London

Trained in neuroscience and electrophysiology but self-taught in programming. My solutions may not be the fastest or most elegant but on average they work at an above chance level.

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**16** Questions

**73** Answers

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**Content Feed**

Question

What are the units of the bandwidth parameter for mvksdensity?

I have been using the inbuilt mvksdensity function. For this function the user specifes a 'bandwidth' as a smoothing parameter (...

2 months ago | 0 answers | 0

### 0

answersQuestion

How to provide cameraIntrinsics to triangulateMultiview

I am trying to triangulate matched points recorded by 5 different cameras using triangulateMultiview. The third input required ...

1 year ago | 1 answer | 0

### 1

answerSolved

Find the area of the four walls

If length, breadth and height of the walls are given, find the area of the four walls.

2 years ago

Solved

Find the dimensions of a matrix

Just find the number of columns of the given matrix. Example x = [1 2 3 4 5 6] y = 2

2 years ago

Solved

Sum of diagonal of a square matrix

If x = [1 2 4; 3 4 5; 5 6 7] then y should be the sum of the diagonals of the matrix y = 1 + 4 + 7 = 12

2 years ago

Solved

find the surface area of a cube

given cube side length x, find the surface area of the cube, set it equal to y

2 years ago

Solved

Rounding off numbers to n decimals

Inspired by a mistake in one of the problems I created, I created this problem where you have to round off a floating point numb...

2 years ago

Solved

Getting the indices from a vector

This is a basic MATLAB operation. It is for instructional purposes. --- You may already know how to <http://www.mathworks....

2 years ago

Solved

Maximum value in a matrix

Find the maximum value in the given matrix. For example, if A = [1 2 3; 4 7 8; 0 9 1]; then the answer is 9.

2 years ago

Solved

Check if number exists in vector

Return 1 if number _a_ exists in vector _b_ otherwise return 0. a = 3; b = [1,2,4]; Returns 0. a = 3; b = [1,...

2 years ago

Solved

Reverse the vector

Reverse the vector elements. Example: Input x = [1,2,3,4,5,6,7,8,9] Output y = [9,8,7,6,5,4,3,2,1]

2 years ago

Solved

Most nonzero elements in row

Given the matrix a, return the index r of the row with the most nonzero elements. Assume there will always be exactly one row th...

2 years ago

Solved

Remove any row in which a NaN appears

Given the matrix A, return B in which all the rows that have one or more <http://www.mathworks.com/help/techdoc/ref/nan.html NaN...

2 years 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...

2 years ago

Solved

Determine if input is odd

Given the input n, return true if n is odd or false if n is even.

2 years ago

Question

Shuffling matrix regions while maintaining their shape

Hi all, I want to segment a matrix into parts, then move those parts around while maintaining their shape as far as possible (b...

2 years ago | 0 answers | 0

### 0

answersQuestion

Calculating mean integrated squared error (MISE)

Hi all, I have a bivariate probability distribution ( f1(x) ) and a histogram of real data that I want to compare to it ( f2(x)...

2 years ago | 1 answer | 0

### 1

answerQuestion

Histograms - why does the smallest binsize always give the smallest mean integrated squared error?

Hi all, I have a bit of a specialised question involving histograms and mean integrated squared error (MISE). I want to find th...

2 years ago | 1 answer | 0

### 1

answerHow to do Chi square with contingency tables?

Crosstabs expects the raw data as vectors, if you only have counts you will need to expand your data into vectors, for instance ...

2 years ago | 1

| accepted

Undefined function or variable 'netcdf'

I think your line is supposed to be: f = netcdf.open('algiers_bay.grd','r'); Because netcdf on it's own doesn't do anything,...

2 years ago | 0

How to plot Data from a table filled with strings?

I think your problem is just that the cell array contains strings of different lengths, you can try converting them to numbers i...

2 years ago | 0

| accepted

Can anyone tell me how does this code works?

Hi, It is difficult to know exactly what the code is doing without the data files it is loading. However, at first glance I wo...

2 years ago | 0

| accepted

i have a data set containing urls of images.How can i download all the images from those urls using matlab?

You can read the data into Matlab using importdata: https://uk.mathworks.com/help/matlab/ref/importdata.html?s_tid=doc_ta Then...

3 years ago | 0

Please provide in depth details on PCA MATLAB function

How many features do you give the PCA when you give it the dataset? Just the XY values you plotted in the first graph? Or do you...

3 years ago | 0

| accepted

how do i live plot 3 different values?

Can you be more precise in what you want to achieve? For example, here is the Matlab help example given for animatedline: numpo...

3 years ago | 0

Maximum perpendicular distance from line to convex hull boundary

I had to do something similar to this some time ago, sorry I don't really remember the specifics but I used rayTriGPU: https://...

3 years ago | 0

| accepted

Model Based Reinforcement Learning

Your agent shouldn't be able to make 'invalid' actions at all. For undesired actions, as you say the correct reward function wit...

3 years ago | 0