Matlab problem: How to calculate a rough, approximate, derivative vector by using the following formula?

9 years ago | 0

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Making each element of a row vector equal to zero
You can create a new vector with all zeros by typing the command: new=zeros(1,100) or by using a for loop: for I=1:...

9 years ago | 0

detect consecutive duplicates in a structure
A(1).a=1 A(2).a=1 A(3).a=3 A(1).b=true A(2).b=true A(3).b=false for ii=2:3 ttest(ii-1)=A(ii).a==A...

9 years ago | 0

Different length array comparison and replacements
% data A=[445; 874]; B= [265; 446; 744; 872; 875]; % engine AA=A(:,ones(1,size(...

9 years ago | 0

Extra term in "min" function in while loop
The extra ,DC1(1,j) bit is the next command. You can erase the initial comma and press enter to get it in the next lin...

9 years ago | 1

Finding x & y-values that maximize an expression!!!!
The expression for J does not have any maxima. This can be seen easily by geometric interpretation of the formula. J can be mini...

9 years ago | 0

fft normalization and parseval
In the following code: var1=128; h=complex(randi([-1 1],var1,1),randi([-1 1],var1,1)); h=h/std(h); % no h is normaliz...

9 years ago | 0

HOW TO ACCESS THE FOLLOWING ELEMENTS FROM THE GIVEN ARRAY
a=[ 0 0 0.3013 1.1305; 1.0000 2.0000 0.7390 0.4223; 3.0000 2.0000 1.1305 ...

9 years ago | 0

Regarding Genetic Algorithm Optimization- How to stop GA tool after each generation
t=0.2; % or any other reasonable time value while exist('filename.extension','file')==2 pause(t) end

9 years ago | 0

problem with if test to test the increment in time
T = 1e-4; h = T/100; n = 1000;%par exemple Ts = 0:T:n*T; j = 1; for t =0:h:n*T if ismembc(t,Ts) ...

9 years ago | 0

interpolate data points problem
At least one entry in Y is NaN (Not-A-Number). To find it, type in the command window: find(isnan(Y)) You should check ...

9 years ago | 0

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How to reduce execution time? "If" and "ismember" functions
To make ismember function faster, replace it with either *ismembc* or *ismembc2* functions. *ismembc* returns an array of logica...

9 years ago | 0

How to find the indices of element occuring once in a vector?
A=[1 1 -1 0 0 0 1 0 1 1]; [~,c]=histc(A,unique(A)); out=find(c==1);

9 years ago | 0

How to find the indices of element occuring once in a vector?
A=[1 1 0 -1 0 0 1 0 1 1]; [~,c]=histc(A,unique(A)); out=A(c==1);

9 years ago | 3

code of euler's method
A simple application of Euler method: Define the function: function E=euler(f,a,b,ya,M) h=(b-a)/M; Y=zeros(1,M+1);...

9 years ago | 1

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To sum functions which have two unknowns and finding the min values of these unknowns
See if this works: F=zeros(200,1); xy=zeros(200,2); BS=rand(4,2); r=rand(200); for ti=1:200 for m=1:4 ...

9 years ago | 0

How to generate a total random 6 by 6 Latin Square?
Look at the following: http://www.mathworks.com/matlabcentral/fileexchange/12315-latsq/content/latsq.m Hope this helps!

9 years ago | 0

How to make an anonymous function whose variable is itself a function of another variable?
z = @(phi) cos(phi).^2 + 4*sin(phi).^2 phi = @(x) x.^3 + 4*x.^2 + x +3 z(phi(3))

9 years ago | 1

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how to make output a for loop subtract sequentially a data set below it to give sum of differences
Do you want this: b=2; c=1; d=1; n=4; Y=b*c*d*n; X = [10 13 15 12 17 23 26 19]; f = [1 4 8 10 12 16 18 20];...

9 years ago | 0

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Breaking a function into components?
Make a function named myfunc as follows: %---------------------- function out=myfunc(a,vec) out=a.*vec; end %----...

9 years ago | 0

How to generate an array alternating the values of two others?
A = [1 2 3 4 5 6]; B = [10 20 30 40 50 60 70 80 90 100 110 120 130 140 150]; M1=[A,A,A(1:3)]; M2=B; M=[M1;M2]; Se...

9 years ago | 1

fminunc stopped because it exceeded the function evaluation limit, options.MaxFunEvals = 100 (the default value).
Define the objective function by setting its output with the opposite sign as follows: function F=fun(x) F=-0.2662*x.^6+...

9 years ago | 0

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hi am working on a code for gaussian elimination
The correct function is: function [x,U]=gausselim(A,b) % function to perform gauss eliminination %FORWARD ELI...

9 years ago | 1

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How can I solve system of the matrix differential equation within MATLAB?
eqn = 'D2y - A*Dy - B*y = C'; inits2 = 'y(0)=a, Dy(0)=b'; y=dsolve(eqn,inits2,'x') where a and b are the initial or bou...

9 years ago | 0

trying to delete 2 cells of Nans, NOT To delete the row
At least one of the values of JT_S_TN([13,14,15,34,35,36,55,56,57,76,77,78],2) must be equal to 2 and at least one of the ...

9 years ago | 0

matlab sovle newton raphson method
Look for the following Newton-Raphson solver in the File Exchange: http://www.mathworks.com/matlabcentral/fileexchange/44315-...

9 years ago | 0

simpsons rule in matlab
a= Initial point of integration interval b= Last point of integration interval n= number of sub-intervals (panels) of in...

9 years ago | 0

a problem with for loop and indexinf
A={Array_1;Array_2;Array_3;Array_4;Array_5;Array_6;Array_7;Array_8;Array_9;Array_10}; for k=1:10 AR{k}=exp(A{k})+A{k...

9 years ago | 0