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Test if a matrix is symmetric
Write a logical function that returns 1 if the input matrix is symmetric and 0 otherwise.

oltre 11 anni fa

Risposto
How to do this: Multivariate Interpolation with random data (non-gridded)
vq = griddata(x1,x2,y,x10,x20) hth, George Papazafeiropoulos

quasi 12 anni fa | 0

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how to write the nonlinear constraints in fmincon
Define the constraint function as follows: function [C,Ceq]=confun(x) F1=... F2=... F3=... F4=... F5=... ...

quasi 12 anni fa | 1

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I have n points (x ,y coordinates known) of two parallel lines (not perfect straight ) want to draw lines from first boundary points to second boundary with proper slope . Also want to find min & max distance between the lines.
BOUN1=[ 191 220 189 221 188 222 186 223 186 224 185 225 185 226 185 227 185 228 186 229 187 230 187 231 187 232 187 233 187 23...

circa 12 anni fa | 0

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How to solve linear and non linear equation system?
For 14 equations with 14 unknowns, try fsolve, or any other iterative solver (Newton-Raphson, Arc-Length, line search, etc...) ...

circa 12 anni fa | 0

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Defining a function (including vector dot product) for all the points in 3D
% data dx = 0.1; dy = 0.5; dz = 0.1; [x, y, z] = meshgrid( (1:100)*dx, (1:100)*dy, (1:100)*dz ); X = [x(:) y(:)...

circa 12 anni fa | 0

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Remove NaN from a matrix
ind=sum(~isnan(B)); B(isnan(B))=0; mean=sum(B)./ind

circa 12 anni fa | 2

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find min or max value element from more than two matrices
% data matrix1=rand(2); matrix2=rand(3); matrix3=rand(4); % engine c=nan(4,4,3); c(1:2,1:2,1)=matrix1; c(...

circa 12 anni fa | 1

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How to get the output to a variable
Try this after running your code: fit1.Constant fit1.GARCH{1} fit1.ARCH{1} fit1.Offset

circa 12 anni fa | 1

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how to select higher value in a matrix and change that by introducing an error?
Are you looking for something like this? a= [ 0.83 0.85 0.97 0.1 0.95 0.93 0.2; 0.2 0.12 0.12 0.76 0.77 0.78 0.25; ...

circa 12 anni fa | 1

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i want to save all the value of variable a from all iterations into a single matrix ?
% initial data f=[1 3 5 7 9 11; 2 4 6 8 10 12]; b=[1 2;3 4]; % engine b=b'; [nn,n]=size(f); [m,c]=size(b...

circa 12 anni fa | 0

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Risposto
Draw a line on a 2D plot at a particular x and y values
x=linspace(0,4); y=x.^2; plot(x,y); line([3;3],[0;9],'linestyle','--'); line([0;3],[9;9],'linestyle','--');

circa 12 anni fa | 2

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Risolto

Numbers spiral diagonals (Part 1)
Inspired by Project Euler n°28 et 58. A n x n spiral matrix is obtained by starting with the number 1 and moving to the right...

circa 12 anni fa

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how to make vector sum to one?
W'*ones(N,1)=1

circa 12 anni fa | 2

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how to use multiple linear equality constraints
Convert them into matrix form and look about the input arguments Aeq and Beq in the documentation of fmincon.

circa 12 anni fa | 1

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Extend a vector by extending its elements
If X is a column vector: % initial data d=10; % engine X=(1:d)'; ind=ones(d^2,1); ind(d+1:d:d^2)=1-d; % r...

circa 12 anni fa | 0

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How to detect if a line intersects with itself?
% initial data A = [1 1; 1 2; 2 2; 2 1; 3 1]; tour_order = [2; 1; 4; 3; 5; 2]; % engine sizeA=size(A,1); meanA=...

circa 12 anni fa | 0

Risposto
Testing for an Integer and displaying that value.
% initial data ll=99; ul=500; f=5; % engine lb=floor(ll/f); if lb/2~=floor(lb/2) lb=lb+1; end r...

circa 12 anni fa | 0

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Reduce dimensionality using indices
This is an alternative solution which does not contain external functions, thanks to Jos! % initial data A=ceil(10*rand(...

circa 12 anni fa | 1

Risposto
Reduce dimensionality using indices
After specifying A... d=[1 2 3; 1 1 3; 2 1 1]; B=zeros(3,3,3); B(:,:,1)=(d==1); B(:,:,2)=2*(d==2); ...

circa 12 anni fa | 0

Risposto
Multiple linear regression nonlinear constraints with fmincon
As an example for doing this, I give you an example. Define a function as follows: function er = objfun(a) global y x ...

circa 12 anni fa | 0

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Help me about the error with symsum function to calculate the sum of series ?
Maybe because there is not any analytical formula which gives this sum. Can this function be integrated in an analytic way? I su...

circa 12 anni fa | 0

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Matlab problem: How to calculate a rough, approximate, derivative vector by using the following formula?
x=-10:10; y=x.^2; Yprimenum=diff(y)./diff(x)

circa 12 anni fa | 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:...

circa 12 anni fa | 0

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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...

circa 12 anni fa | 0

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

circa 12 anni fa | 0

Risposto
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...

circa 12 anni fa | 1

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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...

circa 12 anni fa | 0

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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...

circa 12 anni fa | 0

Risposto
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 ...

circa 12 anni fa | 0