# Naor Movshovitz

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Professional Interests: physical modeling; rigid-body dynamics; granular mechanics; planetary collisions

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Question

Documentation error for polyval ouput?

The documentation for polyval describes the optional output argument delta like this: "Standard error for prediction, returned ...

5 years ago | 1 answer | 0

### 1

answerSubmitted

headcount(file_name, header_mark)

Return number of header lines in text file.

5 years ago | 1 download |

Submitted

nmovshov/physunits

Dimensioned variables with enforced dimensional consistency

6 years ago | 1 download |

Solved

Energy of a photon

Given the frequency F of a photon in giga hertz. Find energy E of this photon in giga electron volts. Assume h, Planck's ...

7 years ago

Solved

How to subtract?

* Imagine you need to subtract one number from another using MATLAB. * You will not be using eval for this task. * Given two A...

7 years ago

Question

Huge overhead in fsolve due to fsolve>createExitMsg()

Is it just me or is the fancy exit messaging in |fsolve| creating huge overhead?I imagine this might impact other |optim| toolbo...

7 years ago | 2 answers | 4

### 2

answersQuestion

How to derive a subclass that is a "frozen" state of another class?

Suppose |dynClass| has lots of dependent properties calculated on the fly and/or read from private properties, based on complica...

7 years ago | 0 answers | 0

### 0

answersQuestion

How to test if a function handle belongs to a particular package?

I have a method that accepts a function handle and then needs to branch depending on whether that function is part of |+package1...

7 years ago | 2 answers | 0

### 2

answersQuestion

Is fullfile(0,0) undocumented behavior or bug?

What is the purpose, if any, of non-char inputs to |fullfile|? >> fullfile(0) > In fullfile>refinePath (line 93) In ...

7 years ago | 1 answer | 0

### 1

answerCan I share a copy of a CONSTANT large array between workers of a parpool?

Answering my own question after some more googling and doc search. I am not 100% sure but I think the right answer is: no, this ...

7 years ago | 1

| accepted

Question

Can I share a copy of a CONSTANT large array between workers of a parpool?

I have an N-by-N array, |data|, of _constant_ data that needs to be accessed by each worker of a parallel pool in a |parfor| loo...

7 years ago | 2 answers | 1

### 2

answersQuestion

Can an object with a `Transient` property be used in a parfor loop?

In a class I am using a private property |A|, an |NxN| matrix, to store data that is expensive to compute and may be used many t...

7 years ago | 1 answer | 0

### 1

answerQuestion

How bad is the performance of run time introspection?

From the doc <https://www.mathworks.com/help/matlab/matlab_prog/techniques-for-improving-performance.html (Techniques for improv...

7 years ago | 1 answer | 1

### 1

answerQuestion

is interp1(x, v, x(k), mtd) == v(k) always true?

is interp1(x, v, x(k), mtd) == v(k) always true or does it depend on method and/or type of x and v? Followup: is the an...

8 years ago | 1 answer | 0

### 1

answerDoes the access method of a dependent property get called twice when the property is indexed into?

Confirmed Walter's comment. Indeed the culprit is the keyword end. Here is minimal working example. classdef Untitled ...

8 years ago | 0

| accepted

Question

Does the access method of a dependent property get called twice when the property is indexed into?

I have a class with a dependent property z. The method get.z(obj) returns a vector. This: y = myObj.z(end); appears to c...

8 years ago | 1 answer | 0

### 1

answerSolved

Pizza!

Given a circular pizza with radius _z_ and thickness _a_, return the pizza's volume. [ _z_ is first input argument.] Non-scor...

8 years ago

Question

How to make published html look as good as the blogs on MATLAB Central?

Check out any of the posts on Cleve's Corner, for example <http://blogs.mathworks.com/cleve/2016/06/09/math-and-music/ this one>...

8 years ago | 1 answer | 1

### 1

answerQuestion

Fastest alternative to |y = ones(size(x))| ?

The profiler red flagged this line, in a small function that is called by an inner-loop computation: ... if n == 0 ...

8 years ago | 2 answers | 0

### 2

answersQuestion

What test is validateattributes() using to check for attributes 'positive' or 'nonnegative' ? (possible bug)

Suppose a class MyClass with overloaded operators for comparison with numeric values. In other words, I can call obj = MyCl...

9 years ago | 1 answer | 0

### 1

answerQuestion

How to make user-defined type pass as numeric?

Suppose I have a defined type that behaves like a number. I would like it to pass the test: validateattributes(x, {'numeric...

9 years ago | 1 answer | 1

### 1

answerQuestion

Can webread(url) be used to read a file?

url = 'file:///c:/filename'; raw = webread(url); fails complaining that the file:// protocol is not supported. Can it be...

9 years ago | 0 answers | 1

### 0

answersQuestion

Is it possible to disable datatips in the debugger?

It's a useful feature but unfortunately it causes my screen to flicker and change resolution. Until this bug is resolved (if eve...

9 years ago | 0 answers | 0

### 0

answersSubmitted

sexy

Display a symbolic expression in a human readable form. Extension of the built-in pretty function.

12 years ago | 3 downloads |

Question

How does "warm-up" overhead scale with data size or iteration count?

Everyone knows that when an M-file is run the first time in a Matlab session it runs much slower than the following next runs. T...

12 years ago | 1 answer | 3

### 1

answerQuestion

Can MATLAB tell me which gpu device is the one connected to the display?

For example, with a GTX590, I have two gpu devices to choose from. Now my theory is that for CUDA kernel performance it might be...

12 years ago | 4 answers | 1

### 4

answersSolved

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. Example...

12 years 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 ...

12 years 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...

12 years ago