# Ying Wu

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Question

Plot 2D contour of z at (x,y) coordinates

Hi, I have three arrays with same dimension: xc, rc, P, where xc and yc are coordinates, P is pressure value at (xc,rc). Is ther...

mer än ett år ago | 2 answers | 0

### 2

answersQuestion

How to take first and second order derivative of discrete data?

Hi, I have two discrete signals with constant time intervel dt=0.01, one is y(t) (displacement), one is Cl(t) (force). Each sign...

mer än ett år ago | 1 answer | 1

### 1

answerQuestion

How to calculate differential of scattered data?

Hi, I have time sertis of two signals, one is y, one is Cl, and I'd like to calculate the first and second derivative of these t...

mer än ett år ago | 1 answer | 0

### 1

answerQuestion

How to plot a line of zero value on a surface?

I used surf to generate a 3D surface and see it in 2D view (see below) The dataset and code are also attached. X=[0 0.25 0.5...

mer än ett år ago | 1 answer | 0

### 1

answerQuestion

Read vtk files (created from paraview) into Matlab

Hi, I have many vtk files storing the velocity field information, which is created in Paraview. Now I want to import them into M...

mer än ett år ago | 1 answer | 0

### 1

answerQuestion

How to find maximum among several local peaks?

Hi, I use findpeaks() to locate a few local maxima of a data array as the data may flucuate slightly when closing peak, like the...

mer än ett år ago | 1 answer | 0

### 1

answerQuestion

How to obtain PSD of time series data using pwelch()

Hi, I use pwelch() to calculate PSD of one set time-series data with 40,000 samples. The data is simulation result, and the time...

mer än ett år ago | 1 answer | 0

### 1

answerQuestion

Using diff() or gradient() or other methods to solve the local slope of a set of discrete point?

Hi, I have a set of x and y, each has 44 values, and I use the following method to solve the local slope of this curve. The two...

mer än ett år ago | 1 answer | 0

### 1

answerQuestion

Why thd() function captures incorrect harmonics?

Hi, I use thd() to calculate one time-domain singal, and I try three commands but all fails. Can anyone help me to solve this qu...

mer än ett år ago | 1 answer | 0

### 1

answerQuestion

How to plot envelope of a signal

Hi, I have trouble in plotting a smooth envelope of a signal using the envelope function in Matlab or the hilbert method. The ti...

mer än ett år ago | 1 answer | 0

### 1

answerQuestion

Simulated and predicted response of time-series idnlgrey model in Matlab

I have build an idnlgrey (nonlinear grey box) model using time-series dataset, and the model structure is an ODE system includin...

nästan 2 år ago | 1 answer | 0

### 1

answerQuestion

How to recover .m file lost due to the abnormal termination

Hi, when I run a parallel for-loop in my code.m file, the maltab is terminatted abnormally. And when I reopen the matlab, all th...

ungefär 2 år ago | 1 answer | 0

### 1

answerQuestion

How to find intersection for two lines composed of multiple points (no expression)

Hi, my line1 (x1, y1) and line2 (x2, y2) are plotted using a series of points. And I don't know the exact experssion for these t...

mer än 2 år ago | 0 answers | 0

### 0

answersQuestion

How to remove ticks of right y-axis when plot two y-axes figure using yyaxis

Hi, when I use yyaxis left and yyaxis right to plot two y-axes figure, the y-ticks would be generated automatically. And I want ...

mer än 2 år ago | 1 answer | 0

### 1

answerQuestion

plot 3D grid using mesh() with lack of individual data

Hi, I want to use mesh to plot 3D grids with the format of mesh(x, y, z). My z is a 47*11 matrix, in which the 7 column actually...

mer än 2 år ago | 1 answer | 0

### 1

answerQuestion

Show the xticks in the view of 2D

Hi, I use surf to plot a 3D surface, see below And I want to see it in 2D view, so I use view(2), and I get the figure below....

mer än 2 år ago | 1 answer | 0

### 1

answerQuestion

How to solve a 2nd-order ODE system with space-dependent variable with ODE45?

Hi, I use ode45 function to solve the following 2nd-order ODE system: where X(t) and Y(t) are function of time, and the par...

nästan 3 år ago | 1 answer | 0