约翰·德·埃里里科（John D'Errico）
Retired
不要与我联系。我不会回答问题。时期。我不做你的作业。我不会咨询。退休的数学家，数值分析师，木工，桥梁玩家。
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Answer 50 questions that were unanswered for more than 30 days
于2020年11月15日授予约翰·德·埃里里科（John D'Errico）
Obtain 50 solvers for a problem you have created
于2020年9月10日授予约翰·德·埃里科（John D'Errico）
Like a problem or solution
Awarded to John D'Errico on 13 Oct 2016
2021年下载最多的提交的前十名贡献者
Awarded to John D'Errico on 06 Jan 2022
2020年下载最多的提交的前十名贡献者
Awarded to John D'Errico on 04 Jan 2021
Top ten contributors with the most downloaded submissions in 2019
Awarded to John D'Errico on 02 Jan 2020
您的意见书在一个月内下载了1000次或更多次
Awarded to John D'Errico on 01 Nov 2019
Your submission is selected as "Pick of The Week"
于2019年10月9日授予约翰·德·埃里科（John D'Errico）
Publish your first review
于2019年10月9日授予约翰·德·埃里科（John D'Errico）
Your submissions received 25 five star ratings
于2019年10月9日授予约翰·德·埃里科（John D'Errico）
Publish your first submission
于2019年10月9日授予约翰·德·埃里科（John D'Errico）
Content Feed
Spline vs Linear Interpolation
This is not remotely a question about MATLAB. I'll answer it only because I have some time, and because I do understand interpol...
2días以前|1
|accepted
Quadratic spline having shape preserving property
You cannot define a shape preserving quadratic spline that is differentiable across the breaks. So while you think you want it,...
2días以前|0
|accepted
How to optimize the solution of one optimization function using another?
Why do you think this has any remote reason to converge? Consider this trivial example of a pair of problems, based exactly on t...
2días以前|0
reading the numbers resulting from the loop
为什么这意味着什么？也就是说，数字10^4*2.2567的产物是什么？10^4* 2.2567
2días以前|0
即使在归一化之后，求解具有稀疏基质和致密矩阵的系统时该怎么办？
以某种方式使矩阵标准化无济于事。实际上，根据您的工作，它可能使FEM解决方案无效。Sinc ...
3días以前|1
|accepted
Plot figure for f(y,z)=0
Simple enough. Define the two functions. Then subtract them, and plot using fimplicit. f = @(z) 0.07*z.^2./(0.09 + z.^2); g = ...
4días以前|1
Formulate an objective function with summation terms to solve a linear programming problem
Why would you need fmincon on a purely linear problem? u and v may be different vectors in your eyes, but they can trivially b...
4días以前|0
|accepted
求解MATLAB的微分方程
做出各种假设，我们将解决方案视为：SYMS KA KD C XMAX SYMS X（T）DSOLVE（diff（x）==（ka*c*（xmax-x）-kd*x）/（1+ka*。..
4días以前|0
|accepted
最小，最大和平均值的随机数生成
Sigh. I've probably seen different variations of this question asked at least many hundreds of times over the 40+ years I have b...
6días ago | 0
roots(x) vs root= interp1(y,x,0)
You need to understand the mathematics. Lost you will be without that (to misquote someone named Yoda.) For this polynomial: s...
7días ago | 0
如何在间隔[a，b]中使用指定步骤创建随机矩阵
You can also use indexing. The idea is to generate random indexes. ValidRandomSet = 5:3:34 m = 7; n = 6; ind = randi(numel(V...
9 días ago | 2
How to find the volume of cross-sectional area of a cylinder
是否有一个现成的功能，只能基于不平等，可以为您完成数学？不，您需要做一些...
11días以前|0
|accepted
Error solving bvp4c - Singular jacobian
You have a simple classical ODE, with two INITIAL conditions, not boundary conditions at different ends. So use a tool like ODE4...
13días以前|0
计算第一衍生物后的嘈杂图
You should recognize that differentiation is a noise amplification operator. So any small amounts of noise in your signal, even ...
14días ago | 0
|accepted
fminsearch with side conditions
通常，解决方案是不使用fminsearch。改用更好的优化器。它会更快，您会得到更好的...
14días ago | 0
Obtaining value of highest order derivative over simulation period
Can you use schemes like ODE45, combined with gradient to compute exact estimates of the high order derivatives? Sadly, no. High...
14días ago | 1
三角形中心的加速度
If you have some known parameter at the three corners of a triangle, then the best estimator of that parameter at the center of ...
15días ago | 1
How to use bitn
You cannot define a scalar variable as a binary one with an arbitrary number of bits. You can define integer variables, with a s...
17días以前|0
为什么我在积分中遇到错误（太多论点）
你需要多注意你的代码。For example, just a quick look shows this: Intdoble6=int(int(2*y^2,x,0,1)4*x...
17días以前|0
我要编写一个代码来求解确定的积分。输出格式必须为fprintf。
Do you understand that MATLAB REQUIRES a multiplication operator? You cannot just put a number next to a letter, and expect MATL...
18 días ago | 1
最大似然估计功能
还有另一种方式吗？为什么不否定功能，然后使用像fminbnd这样的工具？或fminsearch。或fmincon或fminunc，或.....
19días以前|0
What optimizer should I use?
This is not a problem of finding an optimizer. This is a problem of understanding how to formulate a problem so that it is possi...
20 días ago | 0
simulation stopped because of step size tolerance and constraints
让我看看。您提出了一个优化问题。求解器返回了一个结果，可以满足您所带来的公差。你...
20 días ago | 0
旋转有关Y轴的曲线以生成3D表面
当然。只需自己写代码即可。说真的，这并不困难。考虑函数y = f（x）。f = @（x）x。*（1-x）;...
20 días ago | 0
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matlab rank of a matrix
Because the call: R = ones(100,100); rank(R,1e-20) attempts to do something that is demonstrably silly, in terms of double pr...
20 días ago | 0
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使用MATLAB，这些项目的哪个项目很容易？
I think you do not understand. ANY project can be either easy, or too difficult for you to handle. What matters is if you unders...
25 días ago | 0
我应该如何处理求解微分方程作为两个变量r，k的函数？
While you COULD use an ODE solver, this is something you would ONLY do if the ODE had no analytical solution. And this ODE has a...
25 días ago | 1
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