Roger Wohlwend
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Means of this numbers
The first column is the date. Use the function datestr zu convert the numbers into Dates. >> datestr(735453) ans = ...
meer dan 9 jaar ago | 0
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ANOVA, different mean in a graph
Boxplot Shows the median and multcompare the mean. That's why the values are different.
meer dan 9 jaar ago | 0
is is possible to copy the output figure onto an excel sheet
If you have the Toolbox Spreadsheet Link it is easy. Otherwise you have to save a figure and then Import in in Excel. But there ...
meer dan 9 jaar ago | 0
How to create a simple cash flow and net investment
cumsum([-Cost1; repmat(Return_pa,20,1)])
meer dan 9 jaar ago | 0
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Interest rate - stagnant years.
Define a vector with the interest rate for each year. r = [zeros(1,2), 0.05*ones(1,8)] Then the account Balance for each...
meer dan 9 jaar ago | 0
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Multivariate Regression with coeffcients constrained to lie on a k polynom
You have to use optimization for your Problem. Use the Matlab function fmincon.
meer dan 9 jaar ago | 0
How to reduce the dimensions of a row vector?
You cannot apply PCA on a vector. You need a matrix for that.
meer dan 9 jaar ago | 1
Automatic ARIMA model identification in MATLAB (like auto.arima in R)
No, there is no such function. You can identify a suitable model with the Information criterions (AIC and BIC).
meer dan 9 jaar ago | 1
Changing variable value after each loop interation and store them in array
for i=1:61 for k=1:8 xx(i,k) = nthroot(Q(i)/((100/k)*B*(S0^(1/2))),5/3); end end
meer dan 9 jaar ago | 0
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Calculate monthly averages without reshaping
A = accumarray(date, variable, [], @mean); MeanValues = A(date);
meer dan 9 jaar ago | 0
How can I enter this equation in matlab?
Use a function handle. f = @(X) (R+1)*F*(-log(1-X)/k1/C + k2*C*X/k1 - k2*C*X^2/2/k1); V = feval(f, X0) - feval(f, R*X0...
meer dan 9 jaar ago | 0
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having two conditions for if statements
if (S == 1) || (S == 2) || (S == 3) if (X(1) == 0) Y = 100 / S; else Y = 0; end end
meer dan 9 jaar ago | 6
Index exceeds matrix dimensions : Error
Albedo(t) only exist if Ps(t) > SS. It seems that for k = 2 this condition is not met, the code in the if-clause is not execute ...
meer dan 9 jaar ago | 0
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How to avoid duplicate records when using datainsert?
No, you can't specify something like that. If you want datainsert to continue with the next dataset if it encounters a duplicate...
bijna 10 jaar ago | 0
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Proving distributive law with for loop
You can do it without a Loop! You *should* do it without a Loop! n = 10000; x=rand(n,1); y=rand(n,1); z=rand(n,1);...
bijna 10 jaar ago | 0
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Stepwise linear regression: unexpected result of form X1*X2 and X1:X2. How to interpret it?
Yes, it is a multiple linear Regression. The model consists of three variables: X1, X2 and X1*X2. The third variable is just the...
bijna 10 jaar ago | 0
The size of my PCA isn't correct
It seems that Matlab expects a Matrix with more observations than variables (i.e. more rows than columns). As you violate that r...
bijna 10 jaar ago | 2
Error using fzero function
As the error message says, _fzero_ needs a function handle as first Input Argument. Your variable _fun_ is a Vektor or a Matrix,...
bijna 10 jaar ago | 0
GARCH Prediction not possible
You invoke the function forecast with Mdl, which is just a model specification and thus contains no coefficients. You have to us...
ongeveer 10 jaar ago | 2
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How to find the optimal p for AR model
You could use the Akaike or the Bayesian Information criterion (Matlab function aicbic). Also consult the page "Choosing ARMA la...
meer dan 10 jaar ago | 0
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Log Returns of Stock Prices
You can keep things quite simple. Import your stock data, create two variables, one - let's call it D - that contains the dates,...
bijna 11 jaar ago | 2
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Select August data from a vector column in the format YYYYMMDD
First convert your time vector into a vector that contains the date as a number. Date = datenum(Date_Vector,'YYYYMMDD'); ...
bijna 11 jaar ago | 0
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P-values for mvregress
[beta,Sigma,E,CovB] = mvregress(X,Y) The fourth output (CovB) is the covariance matrix of the coefficient. You can use that...
bijna 11 jaar ago | 0
Fetching data from Access query in MATLAB
There seems to be something wrong with your database connection, or your query does not exist, or the field. Check those three i...
bijna 11 jaar ago | 0
How do i predict future price by applying moving average?
I always use the function filter to calculate a moving average of length N. N = 3; MA = filter(ones(N,1),N,Y); Howeve...
bijna 11 jaar ago | 0
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max matrix size for linear optimization
You try to solve an optimizing problem with over 5000 variables? I am not surprised that Matlab cannot do that. I think you have...
bijna 11 jaar ago | 0
Inner matrix dimensions must agree.
Try f1 = @(x) (1-2*x).*(exp(-i*x))
bijna 11 jaar ago | 0
VAR with special error structure
First estimate the VAR (X,Y) with the function vgxvarx. Then estimate the parameter f with a regression. After having estimated ...
bijna 11 jaar ago | 0
Cannot type anything in Command Window after run M.file!
You did nothing wrong. When Matlab is busy executing some code it does not allow you to type anything in the command window.
bijna 11 jaar ago | 0
