# Michael Croucher

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**Content Feed**

Is there any work around the error "Array concatenation is not supported"?

As Joss said, what you want to do is outside the scope of what arrayfun can do but all is not lost if what you want is speed-up ...

2 years ago | 0

How to format matrix to 4 decimal places in engineering notation:

There are only a limited number of supported formats that apply automatically to all output. The closest to what you want is sh...

2 years ago | 0

Solved

Get the length of a given vector

Given a vector x, the output y should equal the length of x.

2 years ago

HPC with Matlab no performance improvement

This is a huge topic which has entire Master's level courses devoted to it but I'll try to give an oversimplifed view. TL;DR ...

2 years ago | 2

| accepted

Solved

Calculate Amount of Cake Frosting

Given two input variables |r| and |h|, which stand for the radius and height of a cake, calculate the surface area of the cake y...

2 years ago

For loop only running through the first file and not all files?

How about something like this? path = './'; %just the path to the directory finaldata = []; for year = 1979:2015 for ...

2 years ago | 0

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Question

Variable precision arithmetic in ode45 and others?

Is it possible to use vpa in ordinary differential equation solvers like ode45?

2 years ago | 3 answers | 0

### 3

answersRandom numbers from CDF

You can pass your pd to the random function. Does this do what you want? To get a 100000 by 1 vector of random numbers from yo...

2 years ago | 0

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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...

2 years ago

Can I schedule a job in Matlab online

One way of achieving your aim would be to use the public cloud. Compile your .m file using MATLAB Compiler, install it on a clo...

2 years ago | 0

stl export for geometry from pointcloud/array

I should start this answer with 'I have no idea what I'm doing here'. I found your question interesting and have had a go at it...

2 years ago | 0

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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...

2 years ago

How do I write a 3D matrix to a file, and then read it back in?

I haven't played with the matfile function in this way before so tried a little experiment that may also serve to help you use t...

2 years ago | 2

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 ...

2 years 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:...

2 years ago

Compiling matlab code for the cluster

You need to compile on a Linux machine. You may find that you can compile on the cluster in question -- something to check with...

2 years ago | 0

Path between 2 nodes in a graph

One way to proceed would be to use concomp. Take this example graph s = [1 2 2 3 3 3 4 5 5 5 8 8]; t = [2 3 4 1 4 5 5 3 6 7 9...

2 years ago | 0

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No print contents in slurm.out files

I can't test this as I don't currently have access to a SLURM cluster with MATLAB on it. I guess you submit jobs using the sbat...

2 years ago | 0

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How to insert multiple spreadsheets to a workbook from Matlab

You can add the number of sheets as an extra argument. So, for 5 sheets: eNewSheet = Add(eSheets,[],eSheet1,5);

2 years ago | 0

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How to import symbolic expressions from Python to MATLAB?

Imagine your friend had a Python function that created that expression. Let's call it create_symbolic_expression() and put it i...

2 years ago | 2

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Import excel data from web doesn't work

The main issue is that MATLAB doesn't recognise what Sheet name within that spreadsheet that you want to import. This gets you ...

2 years ago | 0

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fmincon optimization in matlab using OutputFcn

Following the advice at https://uk.mathworks.com/help/matlab/math/output-functions.html, we can use the 'OutputFcn' option. By ...

2 years ago | 0

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fsolve options generate different results

We can learn a little more by asking for more output from fsolve [x,~,~,output_no_options] = fsolve(fun,x0); opts = optimopt...

2 years ago | 0

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How to get convergence in Gradient descent algorithm?

Here's my MATLAB port of that code data=dlmread('data.csv'); X = data(:,1); Y = data(:,2); %Building the model m = 0; c ...

2 years ago | 1

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Unary operator '-' is not supported for operand of type 'function_handle' in for loop function

You have defined D as a function but in line 36 you are not using it as a function. You have defined it as a function of a vari...

2 years ago | 1

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What is the meaning of [0.0;-1.5] in the following lines?

[0.0;-1.5] is a column vector with the two values 0.0 and -1.5. Mathematically, it looks like this:

2 years ago | 0

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Mex and digraph in C++

I discovered this thread while googling for the same question as Lightonz. It appears there is a way to do this now using matl...

2 years ago | 0