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J. Hu


21 total contributions since 2012

Professional Interests: Structural Engineering

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Answered
Can I use an image as 3D plot's face texture?
I found answers: http://www.mathworks.com/matlabcentral/fileexchange/27764-map-texture-to-patch http://www.mathworks.com/m...

5 years ago | 0

| accepted

Question


Can I use an image as 3D plot's face texture?
For example, I defined an object Obj using vertices and faces. I can set the face color using Obj.facecolor = 'r'; I wanted to ...

5 years ago | 1 answer | 0

1

answer

Question


Why subclass & superclass in OOP?
I am a beginner in OOP. So far I found it very powerful. However, there is one concept, subclass & superclass, I do not understa...

6 years ago | 2 answers | 2

2

answers

Question


Is it possible to define the properties for a class using cell array?
For example, I have a cell array AA={'x' 'y' 'z'} obtained by reading external files such as Excel table. How can I define the p...

6 years ago | 1 answer | 0

1

answer

Question


Should I use primary or dependent property?
There is one property which by nature is dependent property because it is obtained from calculation using primary independent pr...

6 years ago | 2 answers | 1

2

answers

Question


How to get Dependent Property depending on properties of objects of different class
See the code below: Ex_ObjA.m--> classdef Ex_ObjA properties a end methods ...

6 years ago | 1 answer | 0

1

answer

Question


what are the differences between [] and '' in a cell array, how to identify and differentiate them?
c1={'a',[],'b'}--> isempty(c1(2))=0; Not empty size(c(2))=1 1; strcmp(c(2),[])=0; Not a string c2={'a','','b'}--> ...

6 years ago | 2 answers | 0

2

answers

Question


How to determine if an entry is cell type or others?
I wanted to have a function to remove the empty cell, Null cell, NaN in a vector: A = [2 NaN 3] % DatawEmpty example B = {...

6 years ago | 1 answer | 0

1

answer

Answered
Problem with assigning properties to object array in class
After adding following like in http://www.mathworks.com/help/matlab/matlab_oop/creating-object-arrays.html: if nargin ~= 0 % ...

6 years ago | 0

Question


Problem with assigning properties to object array in class
Why I got error message for following code and how can I fix it? Thanks... ObjArray.m: clear all; clc A= {'a',2;'V',3}; ...

6 years ago | 1 answer | 0

1

answer

Question


How can I calculate dependent properties and assign them to the object?
Given a property for an object, need to calculate some values and assign them to the properties of the same object. I use follow...

6 years ago | 2 answers | 0

2

answers

Question


How to do Matlab Object Orientated Programming for catenated Objects
I am a beginner for OOP. I tried some simple examples and found out it is really good. So I wanted to apply to a more complicate...

6 years ago | 0 answers | 0

0

answers

Question


Problem with retrieving mySQL data with DATE column
I have this problem for data table in mySQL DB with column defined using DATE format such as `InstallDate` date NOT NULL, ...

6 years ago | 0 answers | 0

0

answers

Question


How to create variables using strings in an array?
str1={'x','trs','height','width'} str2='db_xtr' For example, I wanted to do: for ivar=1:size(str1,2) C_%str1%_%str2%=ivar^...

6 years ago | 2 answers | 0

2

answers

Question


Why is this SQLquery in Matlab returning repeated records?
I used JDBC driver to connect to the mySQL DB in Matlab. The connection works. However, when I used following SQLquery in Matlab...

6 years ago | 0 answers | 0

0

answers

Question


why the only first row of the imported data using importdata is not correct
I have following data copied from excel file and then pasted to a file "x.txt": USName Height Width Thickness Area -...

6 years ago | 1 answer | 0

1

answer

Answered
why the only first row of the imported data using importdata is not correct
If I switch the first and second row as: - - - - in^2 USName Height Width Thickness Area L1x1x1/8 1 1 0.125 0.234375 ...

6 years ago | 0

Question


How to get the smallest diameter of a cicular pipe enclosing many points in 3D space?
I wanted to know the mathematics and then use Matlab to do it. In 2D plane, for example, if there are three points, then the...

6 years ago | 2 answers | 0

2

answers

Question


How to get the rotation matrix and associated Euler Angles for the rotation of 3D objects depicted by the coordinates of its vertices
How to get the rotation matrix and associated Euler Angles for the rotation of 3D objects depicted by the coordinates of its ver...

6 years ago | 0 answers | 0

0

answers

Question


How to unify the code for reading XML file with varied field length?
To read the attribute value in an xml file like below with single field (length=1) <A Xvalue="3"> </A> I use AXvalue ...

7 years ago | 0 answers | 0

0

answers

Question


How to get the numeric value from text after parsing an xml file?
I use xml2struct to read the xml file into a structure. However, the format of all info are text. For example, attributes z='18'...

7 years ago | 1 answer | 0

1

answer