Community Profile Luca Amerio

Politecnico di Milano

57 total contributions since 2011

Professional Interests: Civil and structural engineering

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Question

Why this bandpass butterworth is unstable (while the corresponding low and high pass are stable)?
I have a signal sampled at 750Hz T = 60; fs = 750; t = (0:T*fs-1)/fs; x = sin(6*t) + 0.1*rand(size(t)); I want to filter ...

1 month ago | 1 answer | 0

1

Question

Apply Frequency Response Function to time series
I have a time series and a (complex) frequency response function . I want to compute the time history obtained applying to ...

1 month ago | 1 answer | 0

1

Question

What `gcbf` stands for?
I never remember the syntax of the gcbf command because I cannot understand what it stands for. gcf stands for "Get Current Fig...

1 month ago | 1 answer | 0

1

Submitted

HDF2Struct
Reads HDF5 files and returns data in a structure

Question

How to fit a line through this data "smartly" ?
I have the x-y data shown in the figure below (for the curious, it is the logarithm of the amplitude of a Hilbert transform). ...

5 months ago | 3 answers | 0

3

image(x,y,A) fails on log axis depending on axis's limits
From the MATLAB Technical Support: ------------------------------------------------------------------------------------------...

1 year ago | 0

| accepted

Question

Apply function (str2double) to each element in a timetable
Hi I have a timetable where some numeric fields are stored as strings and other as 1x1 cell arrays of strings (of char array ...

1 year ago | 1 answer | 0

1

Solved

Pizza!
Given a circular pizza with radius _z_ and thickness _a_, return the pizza's volume. [ _z_ is first input argument.] Non-scor...

1 year ago

Question

slicing an M-by-N-by-3 matrix using an M-by-N matrix of logical values
Hi everybody I have an RGB image as a MxNx3 matrix. I would like to slice it using an MxN matrix of logic values (one for ...

1 year ago | 2 answers | 0

2

Question

image(x,y,A) fails on log axis depending on axis's limits
Hi The question is pretty much self explanatory given the following example The following code *works*: figure A = r...

1 year ago | 2 answers | 1

2

Question

New instance of matlab opening every time I double click a matlab file
Hi Every time i double click a matlab file (*.m, *.mat or *.fig) in an explorer windows, a new MATLAB instance starts, even if ...

1 year ago | 1 answer | 2

1

Question

Interactive GUI Patch/Tessellation
Hi everybody I'm trying to design a GUI where the user is able to draw a series of connected patches (a tessellation) over a ...

1 year ago | 0 answers | 0

0

Question

Hi I'm trying to install MinGW to compile a .c file. I'm using the Add-Ons menu as suggested by https://it.mathworks.com/help...

1 year ago | 2 answers | 3

2

Solved

calculate PI without using pi function
There are many methods to get the pi(Ratio of circumference to diameter). You should get pi without using the pi function in M...

1 year ago

Question

Get maximum number of outputs from anonymous function
Hi everybody. I would like to call a function from within another function. The problem is that i don't know a-priori the numbe...

1 year ago | 2 answers | 0

2

Submitted

tabbedFigure(parentFig,tabName,source)
Creates a new tabbed figure window or adds a new tab to an existing one. Question

Neural network with time-history input
Hi everybody I would like to create a NN with a time-history as input and a single value as output How can I do it? than...

2 years ago | 1 answer | 0

1

Question

Find estimator for bivariate distribution
Hi I have a set of Joint Probability Density Functions obtain from some sets of data. I would like to find the "best fitting li...

2 years ago | 0 answers | 0

0

Question

Equivalent of [C{:}] for vertcat
To concatenate horizontally the content of a cell array we can use the very practice syntax [C{:}]. For example: A = {(1:3)...

2 years ago | 4 answers | 1

4

Question

Compute that portion of a surface above a threshold
Hi. I have a variable Z define over a grid of points X,Y. I would like to compute the area of my domain where Z>threshold. ...

2 years ago | 1 answer | 0

1

Question

CurrentCharacter properties not working as expected
Hi everybody. if I run the code h=figure; h.CurrentCharacter=char(i); disp(double(h.CurrentCharacter)) for i=1,...

2 years ago | 1 answer | 0

1

Question

Pause until a figure close OR a button is pressed
Hi. In the middle of my script I ask the user to zoom a figure and call ginput afterwards. I would like to interrupt (return)...

2 years ago | 1 answer | 0

1

Question

Create a nested structure using a variable as field name
Hi everybody Lets say that I have a variable path='\levelOne\levelTwo\levelThree' of which *I don't know the number ...

2 years ago | 1 answer | 0

1

Question

Save changes to class properties with dot notation
Let's say I have a simple class like this one: classdef MyData properties Data = 0; end methods ...

2 years ago | 1 answer | 0

1

Submitted

uiselectobject
ask the user to select an object of the specified type

Submitted

defaultValue - set default value for optional arguments
Assigns default value to funtion optional input variable

Submitted

Plot persistent vertical and horizontal line
Draws a horizontal or vertical line that persists through pans and zooms

Question

GUI - set a object to be selectable or not
Hi everybody. I have a GUI (programmatically created) with an axis in it. I would like to have the zoom/datatip/select comman...

3 years ago | 1 answer | 0

1

Question

Script vs Function with no input/output
Sometimes I have to write a function ad-hoc for a script purpose. Usually I was simply creating a new .m file containing the fun...

3 years ago | 1 answer | 0

1

Question

Insert NaNs (or any value) in several position of a vector
Hi i have a vector like this a=[1 2 3 5 6 7 9 10 13 14]; I would like to find where the diff is bigger than a value (le...

4 years ago | 2 answers | 0