I joined The MathWorks in the Technical Support department during the summer of 2001 and transferred into the Quality Engineering department in March of 2004. I now work qualifying the core MATLAB numerical functions (PLUS, MINUS, LU, FFT, ODE45, etc.)

Professional Interests: mathematics, MATLAB

For assistance with MATLAB question please post to MATLAB Answers or contact Technical Support using the Contact Us link in the upper-right corner of the page instead of contacting me directly.

Answered

How to write a short syntax for the legend?

Set the DisplayName property of each line just like you set the LineWidth. Then legend show will make the legend appear and use ...

How to write a short syntax for the legend?

Set the DisplayName property of each line just like you set the LineWidth. Then legend show will make the legend appear and use ...

43 minutes ago | 0

Answered

hour of datenum type

What is the full and exact text of the error messages they receive? Show all the text displayed in red (and if there is any text...

hour of datenum type

What is the full and exact text of the error messages they receive? Show all the text displayed in red (and if there is any text...

4 hours ago | 0

Answered

Solve system of linear equations ...matrix output is not as expected

A being a 9-by-9 matrix is correct. syms A11 A12 A13 A21 A22 A23 A31 A32 A33 real; eq1 = A11*-0.001179+A12*-6.581+A13*0.008...

Solve system of linear equations ...matrix output is not as expected

A being a 9-by-9 matrix is correct. syms A11 A12 A13 A21 A22 A23 A31 A32 A33 real; eq1 = A11*-0.001179+A12*-6.581+A13*0.008...

9 hours ago | 0

| accepted

Answered

How can I do to enable zoom only for a specific axes?

Call zoom with an output. Call setAllowAxesZoom on that object. See the "Object Functions" section on the documentation page for...

How can I do to enable zoom only for a specific axes?

Call zoom with an output. Call setAllowAxesZoom on that object. See the "Object Functions" section on the documentation page for...

11 hours ago | 0

Answered

Task: write matlab code for a class MinAngle which calculates the minimum angle between two bearings (bearing A and bearing B).

The assignment operator in MATLAB is =. The element-wise comparison operator is ==. But you should use neither of those in your ...

Task: write matlab code for a class MinAngle which calculates the minimum angle between two bearings (bearing A and bearing B).

The assignment operator in MATLAB is =. The element-wise comparison operator is ==. But you should use neither of those in your ...

13 hours ago | 0

Answered

Switching between open files in editor by searching

There is an API you could potentially use for this sort of task. I have my installation of release R2019b open, so I'll just ope...

Switching between open files in editor by searching

There is an API you could potentially use for this sort of task. I have my installation of release R2019b open, so I'll just ope...

13 hours ago | 0

Answered

Integral Function inside while loop only works for certain values. ArrayValued results in empty volumn vectors.

You probably want to recompute S *while* it is empty not *if* it is empty. Otherwise S could still be empty after the second vpa...

Integral Function inside while loop only works for certain values. ArrayValued results in empty volumn vectors.

You probably want to recompute S *while* it is empty not *if* it is empty. Otherwise S could still be empty after the second vpa...

23 hours ago | 1

Answered

how do I take the matrix A and a vector with the indexes of the rows to be considered, and takes out a vector of the mean values?

function A(meanValue) = HW3Part3Function A(meanValue) = mean((A(1:2:end,:),2)) When you define your function, the function dec...

how do I take the matrix A and a vector with the indexes of the rows to be considered, and takes out a vector of the mean values?

function A(meanValue) = HW3Part3Function A(meanValue) = mean((A(1:2:end,:),2)) When you define your function, the function dec...

1 day ago | 0

Answered

convert logical values to numeric values

What do you want the double array to represent? Just 0 and 1 instead on false and true? Use Jan's approach. 0 where there isn'...

convert logical values to numeric values

What do you want the double array to represent? Just 0 and 1 instead on false and true? Use Jan's approach. 0 where there isn'...

1 day ago | 0

Answered

Syntax Question, Why does this equal zero?

What happens if you compute it by hand? Start with the expression in the parentheses since they're at the top level of the opera...

Syntax Question, Why does this equal zero?

What happens if you compute it by hand? Start with the expression in the parentheses since they're at the top level of the opera...

2 days ago | 0

Answered

Can I assign a variable to a number in a matrix from another matrix?

There's a way to do this without creating 2*n individual variables. A = magic(7); E = eig(A); w = E(1:3); m = [3; 11; -7];...

Can I assign a variable to a number in a matrix from another matrix?

There's a way to do this without creating 2*n individual variables. A = magic(7); E = eig(A); w = E(1:3); m = [3; 11; -7];...

2 days ago | 0

Answered

Not Enough Input Arguments

Your function can be called with at most two inputs, and since it uses both inputs on the line you called out it must be called ...

Not Enough Input Arguments

Your function can be called with at most two inputs, and since it uses both inputs on the line you called out it must be called ...

2 days ago | 0

Answered

Convert Text into Date Format

If you have a number: x = 196307; datetime(100*x+1, 'ConvertFrom', 'yyyymmdd') If you have text: y = string(x); datetime(y,...

Convert Text into Date Format

If you have a number: x = 196307; datetime(100*x+1, 'ConvertFrom', 'yyyymmdd') If you have text: y = string(x); datetime(y,...

2 days ago | 1

Answered

represent a function in Matlab

Let's look at your function symbolically. xo = 400; yo = 7000; x = 260; y = 6954; a = 0.5; b =0.4; K = b*xo-a*yo; % t=...

represent a function in Matlab

Let's look at your function symbolically. xo = 400; yo = 7000; x = 260; y = 6954; a = 0.5; b =0.4; K = b*xo-a*yo; % t=...

2 days ago | 0

| accepted

Answered

Fit operation with defined variables

See the "Create Fit Options and Fit Type Before Fitting" example on the documentation page for the fit function. It uses the 'pr...

Fit operation with defined variables

See the "Create Fit Options and Fit Type Before Fitting" example on the documentation page for the fit function. It uses the 'pr...

3 days ago | 1

| accepted

Answered

Array indices must be positive integers or logical values.

If x only has one element, x(end-1) is an attempt to access element 0 of x. Arrays in MATLAB don't have an element 0. Their firs...

Array indices must be positive integers or logical values.

If x only has one element, x(end-1) is an attempt to access element 0 of x. Arrays in MATLAB don't have an element 0. Their firs...

3 days ago | 0

Answered

How to define these two functions?

The name gamma already has a meaning in MATLAB, and in fact it calculates the function you're trying to evaluate with your anony...

How to define these two functions?

The name gamma already has a meaning in MATLAB, and in fact it calculates the function you're trying to evaluate with your anony...

3 days ago | 1

| accepted

Answered

How do I calculate this definite integral in matlab

When I encounter a problem integrating, one of my first thoughts is to look at the function I'm trying to integrate over the int...

How do I calculate this definite integral in matlab

When I encounter a problem integrating, one of my first thoughts is to look at the function I'm trying to integrate over the int...

3 days ago | 1

Answered

use vector as input

So you want to compute the value of e and the time required to compute that value for each element of n? A couple of suggestions...

use vector as input

So you want to compute the value of e and the time required to compute that value for each element of n? A couple of suggestions...

3 days ago | 0

Answered

How to extend the colon operator for my own class

The colon function in MATLAB for numeric inputs does not return an iterator, it returns a vector. See the documentation page for...

How to extend the colon operator for my own class

The colon function in MATLAB for numeric inputs does not return an iterator, it returns a vector. See the documentation page for...

3 days ago | 0

Answered

Invalid Simulink object name: loader &&& xPC：unable to load dependent module FAST_Library_Win32.dll @ MathWorks Support Team

Since you've mentioned MathWorks Support Team in the title of this question, it seems like you're looking for help from Technica...

Invalid Simulink object name: loader &&& xPC：unable to load dependent module FAST_Library_Win32.dll @ MathWorks Support Team

Since you've mentioned MathWorks Support Team in the title of this question, it seems like you're looking for help from Technica...

3 days ago | 0

Answered

How do you create a composite function in matlab?

f = @sin; g = @cos; % define it two different ways fg = @(x) f(g(x)); h = @(x) sin(cos(x)); % Compare the two approache...

How do you create a composite function in matlab?

f = @sin; g = @cos; % define it two different ways fg = @(x) f(g(x)); h = @(x) sin(cos(x)); % Compare the two approache...

3 days ago | 0

| accepted

Answered

Comparing elements of one vector with multiple values in a matrix of different size

If the rows in A are sorted and disjoint, this does seem like a job for histcounts. Just ignore the bins representing the spaces...

Comparing elements of one vector with multiple values in a matrix of different size

If the rows in A are sorted and disjoint, this does seem like a job for histcounts. Just ignore the bins representing the spaces...

3 days ago | 1

Answered

Passing time step from ODE solver (ode23tb) to ODE function

The evaluation of 'blah' depends on all previous steps taken. That sounds like you don't have an ordinary differential equati...

Passing time step from ODE solver (ode23tb) to ODE function

The evaluation of 'blah' depends on all previous steps taken. That sounds like you don't have an ordinary differential equati...

5 days ago | 2

Answered

how matlab stores graphics objects?

The Bytes column of the output of whos does not tell the "truth, whole truth, and nothing but the truth" for certain situations....

how matlab stores graphics objects?

The Bytes column of the output of whos does not tell the "truth, whole truth, and nothing but the truth" for certain situations....

5 days ago | 0

| accepted

Answered

Array indices must be positive or logical values

for i = 1:N j = i+0.5 y(i+1) = y(i) + h*f(x(j), y(j)); end There's no such thing as the 1.5th element of either x or y ...

Array indices must be positive or logical values

for i = 1:N j = i+0.5 y(i+1) = y(i) + h*f(x(j), y(j)); end There's no such thing as the 1.5th element of either x or y ...

5 days ago | 0

Answered

Standalone application: console blocks program

You may be encountering the behavior described in this Stack Overflow post.

Standalone application: console blocks program

You may be encountering the behavior described in this Stack Overflow post.

5 days ago | 1

Answered

what kind of license do I need?

I advise you to contact the Sales department and work with them to determine the license configuration that will best meet your ...

what kind of license do I need?

I advise you to contact the Sales department and work with them to determine the license configuration that will best meet your ...

5 days ago | 0