# Paul Hoffrichter

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**Content Feed**

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...

4 months 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...

8 months 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...

11 months 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...

11 months 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-"...

11 months 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...

11 months 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; ...

11 months 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...

11 months 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)

12 months 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( ...

12 months 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....

12 months 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));

1 year 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 = ...

1 year 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 ...

1 year 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...

1 year 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...

1 year 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' ...

1 year 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...

1 year ago | 0

How can I insert zeros into every other index of a column vector?

@carles Martinez >> and in an horizontal array? Whether A is vertical or horizontal, use upsample. A = 1 2 3 ...

1 year ago | 0

How to write summation in matlab with two variables?

I am new to sym, so I thought I would give this a try. Please check carefully, as I did not have time to do so. I hope you are d...

1 year ago | 0

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Newton Raphson - saving all values and using last iteration value as initial for next

The final x values match your spreadsheet results. Your suggested x0 converges too soon to be interesting. Set it to 1.0 to actu...

1 year ago | 0

Index in position 1 is invalid. Array indices must be positive integers or logical values.

Would be very useful if you are able to post a minimal program exhibiting the error that we could run. In the debugger, set the ...

1 year ago | 0

Index in position 1 is invalid. Array indices must be positive integers or logical values.

Would be very useful if you are able to post a minimal program exhibiting the error that we could run. In the debugger, set the ...

1 year ago | 0

I need help with using a while loop

Looks like you are trying to solve a difference equation. Take a look at what is happening: c1 = 0.1; v1 = 0.1; v2 = 1; p = ...

1 year ago | 1

| accepted

Keep a temporary variable after parfor

>> Parfor loop works when i comment out the plotting parts of the code. I tried what you said and only experienced what you wro...

1 year ago | 0

| accepted

how to fix Warning: Imaginary parts of complex X and/or Y arguments ignored

If you have a negative number raised to a non-integer power, you can sometimes get a complex number. Take a look at: https://ww...

1 year ago | 0

Solving a simple equation

Sorry, no idea if this is right. clc, clearvars %Angle = B %Thickness = u %Inner Radius = p %Developed length = L %L = L1+...

1 year ago | 0

| accepted

Question

Convert near zero complex parts to 0

In R2020a, I took a complex vector and converted near zero parts to zero. It took two long lines to do it. Can it be done in one...

1 year ago | 1 answer | 0

### 1

answerWhat am I doing wrong here? I am trying to recreate following highlighted equations in the table.

clc; clear; clf ep = linspace(0,1); m1 = 1.5; m2 = 3.8; ep0= 1; alpha = 0.785; epp = 0.11; qep = (2.76*ep.*cosh((3*ep)-1.92)...

1 year ago | 0

| accepted

Script not found in the Command Windows

I am expecting that you will get the following: >> which essai 'essai' not found. Write down the folder where your essai.m fi...

1 year ago | 0