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How can I insert a sequental columns in a matrix with a lag of three columns?
A=randi(9,4,3) n=size(A,2) B=nan(size(A,1),n*3) idx=1:3:size(B,2) B(:,idx)=A

environ 10 ans il y a | 0

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How to add new rows to text file with missing data?
s=importdata('fic.txt') out=zeros(s(end,1),4) out(s(:,1),:)=s

environ 10 ans il y a | 1

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How to use findpeaks?
You can find what you want in the help <http://www.mathworks.com/help/signal/ref/findpeaks.html>

environ 10 ans il y a | 0

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How to delete empty lines in a table
If A is your table idx=all(cellfun(@isempty,A{:,:}),2) A(idx,:)=[]

environ 10 ans il y a | 2

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Read text file in MATLAB
M=importdata('yourfile.txt') a=regexp(M,'\S+','match'); b=strrep([a{:}],'j','j*') c=str2double(b) out=reshape(c,[],2)

environ 10 ans il y a | 0

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How can I delete header from a .txt file and save it?
fid=fopen('file.txt') s=textscan(fid,'%s%s%s%s%s','headerlines',1) fclose(fid) ss=[s{:}] fid1=fopen('file.txt','w') for k...

environ 10 ans il y a | 0

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Replace Cell Array with other Cell Array
a1 = { 'i', 'love', 'you', 'you', 'love'; 'i', 'you', 'love', 'i', 'much'} a2 = { [], [], [], 'so', 'much...

environ 10 ans il y a | 0

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How to find the value in a column that's most close to a specific number?
A = [1;2;3;4;5;6;7] b=2.7 [~,idx]=min(abs(A-b))

environ 10 ans il y a | 1

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Problem: Invalid dimensions specified for output port..
C=0 and D=0 means that your system output will be always equal to 0. Plus the feedback K*u is a 1x5 array when your state space ...

environ 10 ans il y a | 0

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Dividing matrix in four parts
A=rand(210,3); out=mat2cell(A,[40 60 30 80]',3) You have your 4 matrices out{1} out{2} out{3} out{4}

environ 10 ans il y a | 0

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How to separate log file data containing different strings?
fid=fopen('fic.txt') line=fgetl(fid); k=1; while ischar(line) a{k,1}=line; line=fgetl(fid) k=k+1 end fclos...

environ 10 ans il y a | 0

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how can I generate a sequence of sinc pulses corresponding to a given sequence.like for 1 plot positive sinc and for 0 plot negative but in sequence and on same plot
t=-5:.001:5; x = randsrc(1,200,[1,-1,; .5,.5]); n=length(x); w=0.5; p=sinc(2*w*t); figure hold on for ii=1:n plot(...

environ 10 ans il y a | 0

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roots of a complicated function
Use solve function <http://www.mathworks.com/help/symbolic/solve.html>

environ 10 ans il y a | 0

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convert symbols to variables
syms x d f = x*sin(d) df=diff(f,d) d1=pi x1=5 out=subs(df,[d x],[d1 x1])

environ 10 ans il y a | 0

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Search for an element in cell array?
A=[NaN 51.1512 4.0000 6.0000 NaN 80.7646 3.0000 6.0000 NaN 89.3755 2.0000 6.0...

environ 10 ans il y a | 0

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Réponse apportée
I want to create a 3D mesh that looks like this
[xx,yy]=meshgrid(x,y) mesh(xx,yy,zz)

environ 10 ans il y a | 0

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Create a table with values
table function was introduced in Matlab R2013b, what version of Matlab are you using?

environ 10 ans il y a | 1

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Using for loops with a logical to compute means of different Names.
M={'A' '1'; 'B' '5'; 'C' '13'; 'B' '7'; 'A' '11'} [ii,jj,kk]=unique(M(:,1)) out=[ii accumarray(kk,(1:numel(kk))',[],@(x) {me...

environ 10 ans il y a | 0

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What code is needed for the following for example: 'A' '1' ; 'B' '5' ; 'C' '13' ; 'B' '7' ; 'A' '11'
a={'A' '1'; 'B' '5'; 'C' '13'; 'B' '7'; 'A' '11'} b=str2double(a(:,2)) idx=ismember(a(:,1),'B') out=mean(b(idx))

environ 10 ans il y a | 0

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How can i find an eleiment which comes only one in a matrix ?????
A=[1 2;1 3;1 4;1 5;2 4] [ii,jj,kk]=unique(A) b=accumarray(kk,(1:numel(kk))',[],@numel) out=ii(b==1)

environ 10 ans il y a | 1

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Réponse apportée
Finding a row with a certain condition
A=[733458 91 1.01510000000000 1.01680000000000 1.01490000000000 1.01520000000000 1.01585000000000 733458 112 1.01620000000000...

environ 10 ans il y a | 1

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how to remove unwanted zeros from a vector
a=[ 0 5 0 0 0 0 4 5 6 0 0 0 9 9 8 0 7 6 0 0 0 0 0 0 3 4 4 0] idx=a==0 ii1=strfind([0 idx],[0 1]) ii2=strfind([idx 0],[1...

environ 10 ans il y a | 1

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finding a string in a cell array
ids1={'519448(EPS1MN)' '519448(EPS2MN)' '519448(EPS3MN)' '519448(EPS4MN)' '519448(EPS5MN)' '519448(LTMD)' '519448(P)' '...

environ 10 ans il y a | 0

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Réponse apportée
Concatenate cell of arrays
A={randi(5,3,5) randi(5,2,5)} B=cell2mat(A')

environ 10 ans il y a | 1

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Cumulative sums of values corresponding to all duplicate values in a vector
Identification = [1 1 1 1 2 2 2 3 3 3 3 3 3 4 4 4 5 5 5 5 5] Year = [2013 2012 2011 2010 2012 2011 2010 2008 2007 2006 2005 2...

environ 10 ans il y a | 0

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How to plot two functions by using looping values in the same graph using Matlab?
instead plot, use scatter function scatter(j,m) Or store all your values in one array called m with same size as j, and ...

environ 10 ans il y a | 0

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How to convert a file containing real numbers into binary/hexadecimal?
You can use dec2bin and dec2hex function

environ 10 ans il y a | 0

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How to get pair of subplots in two different figures.
figure(1) plotyy(t1,x1,t2,x2) figure(2) plotyy(t3,x3,t4,x4)

environ 10 ans il y a | 0

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How to select elements in an array that are in sequence?
a=[1 2 3 4 31 32 33 34 35 36 37 38 39 40 41 42 56 57 58 59] id=[1 diff(a)]==1 ii1=strfind([0 id],[0 1]) ii1(2:end)=ii1(2:en...

environ 10 ans il y a | 0

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How to sort or rearrange a column with respect to the other column?!
Use sortrows function. For example A=[241 5;1245 4;684 4;806 4;674 3] B=sortrows(A,2) % Or by descending order B...

environ 10 ans il y a | 1

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