# Paul Hoffrichter

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Find a Pythagorean triple

Given four different positive numbers, a, b, c and d, provided in increasing order: a < b < c < d, find if any three of them com...

10 months ago

Question

Where is documentation for colon range of the form 1:vector?

I think the following code examples should result in a Matlab error and not be allowed to run. I think the code syntax should be...

1 year ago | 1 answer | 0

### 1

answerQuestion

Why isn't low pass filter centered around zero?

I tried several MATLAB filter examples (in R2020a), but all of them appear to be off-centered. Below is example taken from https...

1 year ago | 1 answer | 0

### 1

answerQuestion

Gfsk demodulation of signals with non constant amplitude

I have a real GFSK signal that occupies 500KHz whose center frequency could be, say 20 MHz. Not doing the diff(angle(Y)) since a...

1 year ago | 0 answers | 0

### 0

answersQuestion

datatip gives same x value for different samples

Here is a simplified example of my problem. How can I get tooltips to show X 500000, X 500001, X 500002, etc.? Instead it shows ...

1 year ago | 1 answer | 0

### 1

answerQuestion

How to manually move (smoothly) a set of evenly spaced xlines

In R2020a on a plot I plan on having a loop to produce 20 xlines that are 200 samples apart. (I know that in later versions, one...

1 year ago | 2 answers | 0

### 2

answersSection color no longer an option in 2021b?

When I called MathWorks about coloring of the call stack lines (above the current function) when stepping through the r2021b deb...

1 year ago | 4

Question

Find longest pattern of [1 0] in array.

I have Bits0 array of 1's and 0's. I would like to get the start/stop indices of the largest sequence of 1 0's. Actually, I expe...

1 year ago | 1 answer | 0

### 1

answerQuestion

View an .slx model without Simulink

I downloaded a free Intro SDR book from MathWorks. But the labs have .slx files. I would like to be able to view the model. I h...

2 years ago | 0 answers | 0

### 0

answersQuestion

Viewing .slx model figue without Simulink

I have Matlab R2020a and R2022a, but no Simulink. I downloaded a free Intro SDR book from MathWorks. But the labs have .slx file...

2 years ago | 1 answer | 0

### 1

answerQuestion

How to zero out short non-zero regions in vector?

For a minLength integer input value, zero out short non-zero regions. The input vector, A, typically will have long regions of ...

2 years ago | 1 answer | 0

### 1

answerQuestion

How to create Plot button for Complex vector?

I would like to be able to highlight a complex vector in the workspace and be able to click a button to plot complex vector the ...

2 years ago | 2 answers | 0

### 2

answers[DISCONTINUED] MATLAB Answers Wish-list #5 (and bug reports)

PROJECTS is too closely coupled with Git CM Some users may want to have a limited view of the files in the Set Path folder list...

2 years ago | 1

How to assign a variable based on an equation?

Inline anonymous functions can be defined as follows: Density_equation = @(x) x^2 + 2*x + 10 T = 1000 Density = Density_equat...

3 years ago | 1

How to set the plot start to zero ? I have some measurements. On the x label, they start from 0 to 6, but from 1 I can see something change on

First of all, you should be aware that the following two expressions are equivalent: >> 1:5.12 ans = 1 2 3 4...

3 years ago | 0

How do I find the separation between the harmonics for a graph of a function sinx/x against x?

Not sure if thisis what you are looking for. x=linspace(-90,90,10000); y=sin(x)./x; figure(11) plot(x,y); axis([-90 90 -1.5...

3 years ago | 0

How create an Histogram of datas?

c = [ "3-" "0" "0+" "0-" "0+" "0" "0-" "0-" "0-" "0-" "3" "0-" "U" "3" "U" "U" "2+" "0" "1-" "2-" "3-" "1-"...

3 years ago | 1

| accepted

Converting a 1D antenna array to planar array in 3D space

Fc=1255e6; %/Hz Carrier frequency C=3e8;%/m/s Speed of light Lambda=C/Fc;%/m Wavelength ESepx=0.49*Lambda; %/m Element separa...

3 years ago | 0

| accepted

How to set the plot start to zero ? I have some measurements. On the x label, they start from 0 to 6, but from 1 I can see something change on

Here is some made up data to illustrate one approach: x = [ 0 1.1 2 3.3 5.12]; y = [146 145.9 145.8 139 128; ...

3 years ago | 0

| accepted

For loop with two conditions

>> this code where it should stop as soon as one of the conditions has met But the break just gets you out of the while loop w...

3 years ago | 1

discrete time signal, i am not able to generate a function for the following question

Try this to fix the error: N1 = 0; N2 = 8; alpha = 0.8; figure(1) x= alpha .^ (N1:N2); plot(x)

3 years ago | 0

How to multiply 2 fft's with different lengths?

Is this your desired effect? [x,Fs]=audioread('hello.wav'); sound(x,Fs); T=1/Fs; disp('Wait for music to complete') pause( ...

3 years ago | 0

How can I run multiple iterations that plot on the same graph?

If you are new to Matlab programming, then you are probably used to a for-loop and you are plotting the curve in each iteration....

3 years ago | 0

How to delete/cancel trailing zeros in complex and imaginary numbers?

a = 1.22000000 + 2.150000000i fprintf("%g + %gi\n", real(a), imag(a)); fprintf("%.2f + %.2fi\n", real(a), imag(a));

3 years ago | 0

How do i create a large matrix with a formula?

Since you did not specify T and f, I assume you wanted symbolic notation. (I picked N = 10 to show a brief output.) N=10; n = ...

3 years ago | 0

How to find the CUP time used by each function in my code?

If you need a profile of the relative time spent in every function when running your entire script, then while viewing the main ...

3 years ago | 0

| accepted

after applying a filter -i design- to a real signal, it returns complex signal after ifft

Your imaginary part only is non-zero due to the usual floating point roundoffs and truncations. Fix this using round: signal=if...

3 years ago | 0

| accepted

How to construct array with certain slope ?

Look at this rotation script example: https://www.mathworks.com/matlabcentral/answers/93554-how-can-i-rotate-a-set-of-points-in...

3 years ago | 0

Problems with changing the order of a binary representation

NJ=4 for i = 1:2^NJ-1 struct(i,:) = fliplr(dec2bin(i,NJ)); end struct = 15×4 char array '1000' '0100' ...

3 years ago | 0

How can I justify my matrices?

I find this form using Live Editor preferable to pretty. syms t1 t2 t3 d3 a2 J11 = [-cos(t1)*(d3*cos(t2+t3) + a2*cos(t2)), sin...

3 years ago | 0