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Answer 10 questions that were unanswered for more than 30 days
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Content Feed
how to find a float number
find( abs( y7 -(-0.3340) ) < tol ) You choose tol. See eps - Floating-point relative accuracy
4 days ago | 0
| accepted
Tiny discussion on good practices in object oriented programming (OOP) through a simple example
"[...]titles of decent books for non-programmers" AFAIK: There is no book on object oriented design and programming with Matlab...
4 days ago | 0
Question
Is the Abstract keyword needed to make a method abstract?
Is this correct Matlab syntax classdef MyClass methods outarg = my_method( this, inarg ); end end R2018b a...
6 days ago | 1 answer | 0
1
answerHow to speed up the while loop?
You didn't test the code before uploading! I modified the input lines z = 1; % input('Enter zeta, z = '); w = 1; % input('Ent...
11 days ago | 0
| accepted
Matrix dimensions must agree.
Because (jy12) is 400x400 and omega is 200x200
11 days ago | 0
I got stuck with a loop after the value gets to NaN
The values of xr and yr do not converge to a solution that you expect. xr goes to zero and yr goes to "infinity". >> Newton_Ra...
16 days ago | 1
| accepted
Why the ouput of disp input function become looping?
The expected output is repeated a zillion times, because yfit is a vector with a zillion elements >> whos yfit Name Si...
17 days ago | 0
| accepted
Split every matrix in cell and make it into different cell
One way %% M = ones(32,32,2,3); % Sample data (20000 replaced by 3) C = mat2cell( M, 32, 32, 2, ones(1,3) ); %% C = sque...
18 days ago | 0
| accepted
How to convert 32x32x2x20000 into 20000x1 cell array?
A mat2cell example %% M = ones(32,32,2,6); % Sample data (20000 replaced by 6) C = mat2cell( M, 32, 32, 2, ones(1,6) ); %...
18 days ago | 0
| accepted
Why is my function not working?
The function must be at the end of the m-file. It's a local file in a script. (Or you can have the script and the function in tw...
19 days ago | 0
I cannot access the comment pane of the MathWorks Blogs. Am I the only one?
Tech support has reproduced the issue and suggests two work arounds Incognito mode in Chrome Clearing cache or cookies "Remo...
23 days ago | 0
Solved
Finding sum of even numbers in a vector.
Find the sum of all the even numbers present in the input vector x. Examples: Input x = [1 2 3 4] Output y is 6 Input...
26 days ago
Do I use the "for loop" correct or efficiently?
Replace the loops by a(1:1800)=50; a(1801:3000)=90; a(3001:3500)=0; to match the figure
27 days ago | 0
| accepted
Specify nature/type of property
... or something like: classdef meals properties food (1,1) struct = struct( 'type',{'wheat'}, 'calories',{...
30 days ago | 0
How to understand a datenum date?
A serial date (number) represents time as the number of days (and fraction of days) from January 0, 0000. sdn = now % the fu...
1 month ago | 0
Question
I cannot access the comment pane of the MathWorks Blogs. Am I the only one?
Over the last week I've failed to access the comment pane of the MathWorks Blogs, but for a few short occasions. Does anybody el...
1 month ago | 1 answer | 0
1
answerStrings to variable names
First a little exercise %% results = readtable('raw_data.csv'); results(4,:) %% results.Properties.VariableNames{'Sigma'} =...
1 month ago | 1
How to call a class-specified overloaded version of a function without using an object instance as an argument
"I don't want to define 'sin' as a static method because then sin(myNum) will not automatically invoke the overloaded function" ...
1 month ago | 1
| accepted
Recursively reversing large vector efficiently
Five ways to flip a row vector. The last one, reversal_v3(), answers your question. Recursion is by two order of magnitude slowe...
1 month ago | 0
Accessing properties in a class
There is nothing special with the name obj, it's just a name. The assignments in the method, fun1, creates a structure (named o...
2 months ago | 0
Gang-of-Four Design Patterns in MATLAB
I'm not aware of any "full or partial MATLAB collection" and I've search for it more than once. Googling for "design patterns ...
2 months ago | 1
How to relocate (left side) the legend in plot ?
Read the documentation on legend() and notice legend(___,'Location',lcn)
2 months ago | 0
| accepted
Creating charts in Matlab
Yes, see the function, bar( ..., 'stacked' ). However, it lacks the 3D character of the bars.
2 months ago | 1
| accepted
MATLAB Answers Wish-list #5 (and bug reports)
Background: I recently put some effort into answering How to store and reuse coefficients in a for loop. My answer together wi...
2 months ago | 1
How to store and reuse coefficients in a for loop
Caveat: I don't fully understand your code and what I say might not be relevant to your real project. "% Can this double for lo...
2 months ago | 1
| accepted
check ismember for each element individually
The function arrayfun() does the trick (i.e. hides the foor-loop) a=[ 1 2 3 3 5 6 6]; b=[1 2 3 5 6]; cac = arrayfun( @(ii) fi...
2 months ago | 0
Is it possible to put multiple functions in one matlab file file?
"I currently have six seperate scripts [you mean functions?]" What differs between the six functions? The name of the nc-files ...
3 months ago | 0
When constructing an instance of class, the constructor must preserve the class of the returned object.
I don't know C++. (For some reason you added the tag "C++".) I guess you are biased by some other language. You need to look cl...
3 months ago | 0
How do I make this a function?
Something like this. With Matlab it's common practise to use double for all numerical variables. (Matlab has "integer in floatin...
4 months ago | 0
| accepted
Create table from structure - alignment
I've modified the format specifier. %% mom.a = 1; mom.b = 2; mom.veryLongName = 3; header = {'Moment'; 'Value'}; fnames = ...
4 months ago | 0
