Community Profile

photo

Josh Meyer


MathWorks

124 2013 年以降の合計貢献数

I write MATLAB Math documentation

連絡する

Josh Meyer's バッジ

  • CUP Challenge Master
  • 3 Month Streak
  • Revival Level 2
  • Knowledgeable Level 2
  • First Answer
  • Scavenger Finisher
  • Solver

詳細を表示...

貢献した分野
表示方法

回答済み
Best integration method to integrate this oscilating function
integral can handle oscillatory integrands as long as there aren't too many oscillations, and you supply plenty of WayPoints in ...

2ヶ月 前 | 0

回答済み
Processing Data in a Tall Array
findgroups and splitapply work with tall arrays, so don't worry about using tall.transform or tall.reduce for this simple task. ...

2ヶ月 前 | 0

回答済み
How does integral2 work?
The basic principle of numeric integration is you are calculating the area under the curve by splitting it up into smaller piece...

3ヶ月 前 | 0

| 採用済み

回答済み
Problem with boundary conditions for PDEPE
From the doc for pdepe, "When m > 0 and a = 0, boundedness of the solution near x = 0 requires that the flux f vanish at a = 0....

5ヶ月 前 | 0

| 採用済み

回答済み
what's the difference in accuracy between solving a stiff problem by ode15s and ode45?
Stiffness is more of an issue of stability than accuracy. Nonstiff solvers can solve stiff problems, it just takes them a long t...

6ヶ月 前 | 0

回答済み
Change font size of node name in a graph
Several new properties were added to GraphPlot objects in R2018b to enable customization of node and edge labels. In particular ...

6ヶ月 前 | 1

| 採用済み

回答済み
Problems with pdepe with disconnected variables in c, f and s
c, f, and s are expected to be column vectors with length equal to the number of equations being solved. Since you have 1 equati...

7ヶ月 前 | 1

| 採用済み

回答済み
Implementing boundary condition in pdepe
The form for the boundary conditions expected by the solver is Since you have a system of two equations, each p and q should ...

7ヶ月 前 | 0

回答済み
pdepe help! (boundry condition in PDE solver)
Your boundary condition function includes the line pl = ul-TT(i); TT(i) is not defined within view of the function, so that i...

7ヶ月 前 | 1

| 採用済み

送信済み


Plotting the Binomial Coefficient
Live script that plots the binomial coefficient over all positive and negative argument combos.

7ヶ月 前 | ダウンロード 0 件 |

Thumbnail

解決済み


Project Euler: Problem 2, Sum of even Fibonacci
Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 te...

12ヶ月 前

解決済み


Triangle sequence
A sequence of triangles is constructed in the following way: 1) the first triangle is Pythagoras' 3-4-5 triangle 2) the s...

12ヶ月 前

解決済み


Find a Pythagorean triple
Given four different positive numbers, a, b, c and d, provided in increasing order: a < b < c < d, find if any three of them com...

12ヶ月 前

回答済み
'Undefined Function or Variable' Error when Function is Defined
Looks like the issue is you define cp in the workspace and the function can't access that variable when it gets called. So, try ...

2年弱 前 | 0

| 採用済み

回答済み
Use griddata ignoring gaps in data
To interpolate without the gaps you need to remove them from the data before interpolating, request values on the full grid (inc...

2年弱 前 | 1

| 採用済み

回答済み
system of 1st and 2nd order differential equations ode45
The documentation explains how to express higher-order equations as first-order equations: <https://www.mathworks.com/help/matl...

2年弱 前 | 0

回答済み
Solving coupled differential equations
The immediate problem is that you provide too many output arguments to ode45. The components of y will be returned as columns if...

2年弱 前 | 0

| 採用済み

回答済み
Commands related to big data and tall array to annalyze data from .csv files.
Check out the documentation: <http://www.mathworks.com/help/matlab/tall-arrays.html Tall Arrays> The general procedure is tha...

2年弱 前 | 2

| 採用済み

回答済み
2nd order numerical differential equation system solving
Use the Symbolic Math Toolbox function <http://www.mathworks.com/help/symbolic/odefunction.html |odeFunction|> to convert the |o...

2年弱 前 | 0

回答済み
I am looking for a way to share the output of my event function with the main function used by the ode solver.
If you specify a terminal event in the event function, then the integration will halt when the event occurs. You can then use th...

2年弱 前 | 0

| 採用済み

回答済み
May you help me please to continue my syytem seconder order DE function?
Since you have boundary conditions you'll want to use bvp4c or bvp5c. See <https://www.mathworks.com/help/matlab/math/boundary-v...

2年弱 前 | 0

回答済み
Dynamics of Vibro-Impact system with impact condition
If you use |ode45| then a chunk of your code becomes moot - you just need the initial conditions |y0| and time span |[t0 tfinal]...

2年弱 前 | 0

回答済み
Event function in ode45
My guess is you are using the "old" way to pass parameters to the ODE function F, where they are specified as trailing input arg...

2年弱 前 | 1

回答済み
How do I speed up ODE15s?
Some things to try... # For stiff problems you should always specify the Jacobian or its sparsity pattern via the options str...

2年弱 前 | 2

| 採用済み

回答済み
How to find probability density for two data sets plotted on same histogram?
Two ideas come to mind... 1. You can combine the data sets into one so that the normalization takes into account the total nu...

約2年 前 | 0

回答済み
How to fix: Index Exceeds Matrix Dimensions
The issue is with the line: M(i,:)=noise(P(i):P(i)+10); You want to take the index |P(i)| and grab the next 10 elements ...

約2年 前 | 0

回答済み
Error message when computing integral: first input argument must be a function handle
If you want to compute the integral symbolically by keeping the line "syms x;", then you'll need to use the function in Symbolic...

約2年 前 | 3

| 採用済み

回答済み
How to construct an undirected graph by reading edge by edge from a text file
You can use |textscan| to read the text file into a cell array, with the first entry listing the source nodes and the second ent...

約2年 前 | 0

回答済み
How to do 2D interpolation
Assuming that |y1| and |y2| are separate functions evaluated at the points in |X|, you are still just doing 1-D interpolation. M...

約2年 前 | 1

回答済み
problems when adding a column to tall array
In the first case the reason you get an error is because you are attempting to add a tall variable to the table that was created...

約2年 前 | 0

| 採用済み

Load more