# Les Beckham

Many years developing flight control algorithms and software

**Programming Languages:**

C

**Statistics**

RANK**190**

of 263.001

REPUTATION**482**

CONTRIBUTIONS

**2** Questions

**184** Answers

ANSWER ACCEPTANCE **
50.0%
**

VOTES RECEIVED**63**

RANK

of 18.000

REPUTATION**N/A**

AVERAGE RATING**0.00**

CONTRIBUTIONS**0** Files

DOWNLOADS **0**

ALL TIME DOWNLOADS**0**

CONTRIBUTIONS**0 Posts**

CONTRIBUTIONS**0** Public Channels

AVERAGE RATING

CONTRIBUTIONS**0** Highlights

AVERAGE NO. OF LIKES

**Content Feed**

Formatting a vector to not include the first value

It seems like you could benefit from taking this introduction to using Matlab: Matlab onramp This is an example of very basic ...

4 giorni ago | 0

| accepted

Using plot handle to replot a graph

Read the documentation for the copyobj function. Here is an example: x = 0:0.1:10; y = [sin(x);cos(x);tan(x)]; for i = 1:3; ...

5 giorni ago | 1

| accepted

how do I swap both axes in the current plot

syms y U = y^2/2 - (3*y)/4; yrange = [0,1]; fp = fplot(U,yrange); plot(fp.YData,fp.XData) grid on

13 giorni ago | 1

| accepted

Code to determine a log of the mean for a column of numbers?

A = magic(4) logmean_col1 = log(mean(A(:,1))) max_col2 = max(A(:,2)) mean_col3 = mean(A(:,3)) mean_col4 = mean(A(:,4))

13 giorni ago | 1

Find unique number sets

A = [1 4; 2 3; 3 2; 1 4]; B = unique(sort(A, 2), 'rows')

14 giorni ago | 0

Why is Q=30 after the loop is ran?

B=1; Q=0; if B==1 && Q~=B Q=20; if B<0 || Q==20 % you just set Q equal to 20 on the line above so this condition is ...

14 giorni ago | 0

| accepted

How to plot the bode plot extracted from LTspice in Matlab?

I used the import tool to import the data as fixed width data (right click on the file in the Current Folder and select Import D...

14 giorni ago | 0

| accepted

If there is a coding "sqrt(sum(data(:,1:end).^2,2))" , so what is the function number 2 after comma?

That tells the sum() function to sum along the rows. See the documentation for sum here

14 giorni ago | 1

| accepted

Extracting data from a matlab figure and saving it as a .mat file

open('6000_1.fig') hl = findobj(gca, 'Type', 'line'); % find the lines x = get(hl, 'Xdata'); % extract the data y = get(hl, '...

15 giorni ago | 1

| accepted

Filling gaps in a vector using a secondary data set

rain1 = [nan nan 1:10 nan nan] % example data rain2 = [20:34] idx = isnan(rain1); % find where rain1 has nans rain1(idx) = ra...

15 giorni ago | 0

| accepted

Guessing the values of a function by using initial values

You don't have to "guess" the values of the function, you can just calculate them. Example x = [-20:.1:20]; y = x; [X,Y] = m...

15 giorni ago | 0

Replacing Values in Matrix that are not equal to 1 while excluding 'NaN'

test1 = [ NaN 2 9 2 -.23 NaN 3 2 -1 -1 NaN 6 -.4 -1 -.57 NaN] test2 ...

16 giorni ago | 0

Concatenating Edit Field value with an existing string in App Designer

First, if you are getting an error, that is usually what will help you (and us) figure out what is wrong so, please, post the co...

16 giorni ago | 0

How to tick the parameter in the plot of a parametric function?

Try this (or something similar): % Your original code t = linspace(0, 1, 1000); x = t.^2; y = t.^3; figure plot(x, y, '-'...

20 giorni ago | 1

Two easy questions (But I am confused)

Using smaller examples so we can see the results: S = magic(10) % sample matrix d = diag(S) % extract the diagonal elements %...

21 giorni ago | 0

How to plot a 3-D "hotspot" figure

I would suggest looking at this example for the scatter3 function: scatter3 with varying marker colors You could use your f(x, ...

22 giorni ago | 1

| accepted

How do I demagnify a help page?

Ctrl-Scroll Down will reduce the magnification

23 giorni ago | 0

| accepted

How can I programmatically open the results of a command in a new window without setting it to a variable?

I can only think of a way to do this in two steps rather than one. result = 2 + 2; openvar('result'); This should work in des...

24 giorni ago | 1

Efficient Way to find index of max column for each row

Are you wanting to find the column number of the maximum value in each row? If so, this is how you can do that: A = magic(5) %...

circa un mese ago | 0

Too many output arguments (five on output)

You are defining this function as a function that takes 5 input arguments and returns one output argument. function y_cubic=cub...

circa un mese ago | 0

Strange result in subtraction operation

The "obvious" result is 1.2e-14 not 1.12e-14 (the different last two digits in your original numbers at the 14 decimal place giv...

circa un mese ago | 0

Removing quotation marks in a string using for loop

The quotation marks are not actually part of the string. It is just displayed that way. Plus, since you are using strings inst...

circa un mese ago | 0

| accepted

What is this center line when I create m file from mlx file?

I believe that what you are seeing (if you are viewing these in the Matlab editor) is the "Right-hand text limit" line. You can...

circa 2 mesi ago | 0

| accepted

How to Extract 2048 values containing the maximum value?

Note that this plots the group that contains the maximum datapoint in all of the data. It does not "plot the largest 2048 value...

circa 2 mesi ago | 1

| accepted

How to find the zero vaue of a plot?

X=[0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20]; Y=[-0.88 -0.7489 -0.6178 -0.4867 -0.3556 -0.2245 -0.0934 0.0378 0.168...

circa 2 mesi ago | 1

| accepted

Display time before the prompt arrows

See this utility on the File Exchange: https://www.mathworks.com/matlabcentral/fileexchange/26471-setprompt-set-the-command-win...

circa 2 mesi ago | 1

| accepted

How to do the example below in MatLab? I am dealing with same sort of problem in matlab

Something like this should do what you want (using made up example data): % simulating read of csv file1 (replace by data1 = re...

2 mesi ago | 1

| accepted

Where is the error in my code?

You need to specify an increment size if you expect r to be a vector. Currently it is a scalar equal to zero. Q will not be a ...

2 mesi ago | 0

help on graph (w/o common matrix plotting built-in functions)

In that case, maybe something like this will get you close. A = randi(2,10,365)-1; x = 1:size(A,2); y = size(A,1):-1:1; for ...

3 mesi ago | 0

| accepted

help on graph (w/o common matrix plotting built-in functions)

A = randi(2,10,365)-1 str = repmat(' ', size(A)); str(A==1) = '-'; disp(str)

3 mesi ago | 1