Community Profile

Guido Travaglini


Università di Roma "La Sapienza"

27 total contributions since 2005

Professional Interests: Statistics, Econometrics, Solar Physics.

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Submitted


An econometric investigation of the sunspot numbers since the year 1700
Econometric analysis of the properties of sunspot numbers from 1700 through the 22.d century

1 year ago | 2 downloads |

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Posted


different colors for consecutive areas
Hi all, I have 2 consecutive vectors X1(T1), X2(T2), where T1, T2 are their respective length. I can plot easily XALL=[X1;X2], y...

2 years ago | 891 views

Submitted


Hockey stick and climate change
Anthropogenic Global Warming (AGW) debunked by means of Bayesian Calibration

2 years ago | 5 downloads |

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Solved


Times 2 - START HERE
Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

5 years ago

Submitted


Amortization schedule with variable interest rates
Computes & optionally saves & plots some variables, like interest paid and balance outstanding.

5 years ago | 1 downloads |

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Answered
Problem to import data from Excel to Matlab
Make sure the path shown in the "Current Folder" window is the same where your XLS file resides.

5 years ago | 0

Responded


Re: Saving text and numeric data with xlswrite
Thanx kinor, however I needed a somewhat different problem to solve, that is: C={'Arts','Science','Cinema'}; for i=1:3 disp([C(1...

6 years ago | 4580 views

Posted


Saving text and numeric data with xlswrite
I have the following string and I want to save with xlswrite the following displayed text and numeric data output: C={'Art','S...

6 years ago | 4580 views

Responded


Re: Advanced PCA Problem: Application to Timeseries
One possible way to deal with time-changing PCA shares in a time series context would be to perform PCACOV with level breaks (r...

7 years ago | 11132 views

Responded


Re: print string and numbers
Many thanx us!

7 years ago | 2129 views

Posted


print string and numbers
I am new to Matlabs printing tools (e.g. sprintf) and I am unable in due time to perform a very simple task. I have 2 vectors of...

7 years ago | 2129 views

Responded


Re: saving a vector of strings
Thanx a lot, us, it works great! Guido.

7 years ago | 1290 views

Posted


saving a vector of strings
I have a vector of integers N>1 and I want to save the following strings: for i=1:N horzcat('X_',num2str(i)) end into a text v...

7 years ago | 1290 views

Responded


Re: delete rows in a matrix
Many thanx, your suggestions were precious, guido

7 years ago | 3342 views

Responded


Re: delete rows in a matrix
Many thanx, guido

7 years ago | 3342 views

Posted


delete rows in a matrix
Is there a quick way to delete rows one at a time from a matrix of size n-by-n? The objective is to obtain a sequence of n matri...

7 years ago | 3342 views

Responded


Re: correlation
The problem is simpler than I've thought. I've lost(!) the function STATGETARGS and also STATSIZECHK, which affect this file and...

7 years ago | 7310 views

Responded


Re: correlation
The file corr.m has never been removed from the Stats Toolbox, nor have I any duplicates. I have pasted it, as follows: functio...

7 years ago | 7310 views

Posted


correlation
Recently my corr.m file does not work properly. Suppose I have two series x and y of equal length, performing corr(x,y) produces...

7 years ago | 7310 views

Posted


gradient
For tutorial purposes I want to estimate by FMINUNC an Ordinary Least Squares (OLS) problem. I minimize the sum of squared error...

8 years ago | 1347 views

Posted


Yearly to quarterly conversion.
I have the following vector: mydates=[1976:2005]'; and I want to create both a datenum and a datestr of mydates that includes qu...

8 years ago | 3054 views

Posted


Edgeworth expansion
both standard normal and normal? Regards, jay.

8 years ago | 2226 views

Posted


opening window matlabrc
Whenever I open Matlab (2008a) I get a message in the window that says: " Warning: Executing startup failed in matlabrc. This i...

8 years ago | 8225 views

Posted


Filling an array
I have a vector a=[1 2 3 5 8 9 10] which I want to fill with zeros to obtain b=[1 2 3 0 5 0 0 8 9 10], i.e. a time series with ...

9 years ago | 2104 views

Posted


Looping over different datasets.
I have m different datasets, Aj (j=1,...m), each stored as .MAT file. Each Aj (j=1,...m) is of different size [n q], where n=row...

11 years ago | 558 views

Posted


Heteroskedastic artificial series
How can I create artificial series characterized by heteroskedasticity,i.e. by larger variance the larger the mean? Thanks to an...

11 years ago | 557 views

Posted


vector sizing
I have a n-sized vector PVEC of p-values. I want to form a new (n-k)-sized vector containing only the p-values<0.05, thereby exc...

11 years ago | 610 views