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# Binbin Qi

### China University of Petroleum

Last seen: Today Active since 2009

Professional Interests: Machine Learning/ Math/ Geophysics

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Equivalent of c++'s NULL or python' s None in MATLAB
I think you can use class.empty for null in matlab classdef A < handle properties empty = A.empty; end end...

2 months ago | 0

Finding the number of rows to the next row containing a 1
A = [0 0 0 1 0 1 1 1 0 0 0 0 0 1]'; C = find(A); D = (1:length(A)) - C; D(D>0) = D(D>0) + inf'; min(abs(D))' ans = ...

1 year ago | 2

Create Incidence matrix from Graph theory?
ok >> G=digraph( [ 1 2 2 2 3 4] , [4 1 3 4 1 3]); >> I = full(incidence(G)) I = -1 1 0 0 1 0 ...

1 year ago | 1

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Create Incidence matrix from Graph theory?
>> G=digraph( [ 1 2 2 2 3 4] , [4 1 3 4 1 3]); >> full(G.adjacency) ans = 0 0 0 1 1 0 1 ...

1 year ago | 0

Change date format in vector
t1 = datetime("4/1/2019 12:45:00 AM",'InputFormat',"dd/MM/yyyy HH:mm:ss a"); t2 = datetime("15/6/19 18:10",'InputFormat',"dd/M...

1 year ago | 0

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For loop and if else statements with multiple conditions
clear;clc;close all [m, n] = deal(4, 8); matrix_data = rand(m, n); num = ['1st','2nd','3rd', sprintfc('%dth', 4:8)]; for i =...

1 year ago | 1

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How to get specific values from matrix in column 1, based on values in other columns?
clear;clc;close all load sub-01_T2_planktimes R = accumarray(sub01T2(:,2:3)+1,sub01T2(:,1),[], @(x){x}); R{2,2} ans = ...

1 year ago | 0

Histogram Only Plotting 1 Point
I think you can use bar, not histogram bar(error)

1 year ago | 0

Dialog UI and sprintf creating unnecessary new lines
The following is my code. It is can work normally. Can you give your code here? function mydialog(line1,line2,line3) if narg...

1 year ago | 0

How to genneral a repeat array
You can use repelem function to accomplish your question a = 1 2 3 4 >> repelem(a, 3) ...

5 years ago | 0

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How do I convert my .mlapp file into a .exe file?
you can get the main file and use deploytool command

5 years ago | 0

change font size of subplot text
I use the following code, it can work clear;clc;close all subplot(335); fplot(@sin,[-1,1]); tx = text(.5,.5,'y = s...

5 years ago | 0

Area between two curves
if you can get the points of every curve, you can use *polyarea* function to get the area, and then diff

7 years ago | 0

why slow 5 times when tic or toc and expression in one line?
Thank you, I guess the reason is JIT.Now, I confirmed

7 years ago | 0

Question

why slow 5 times when tic or toc and expression in one line?
when tic or toc and the main expression are in one line, it will be slow *5 times* than not in a line *1: tic or toc and the ...

7 years ago | 2 answers | 0