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# G A

75 total contributions since 2012

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Question

multiplication by 0.5 vs division by 2
I tried the following with two options - matrix and scalar clear; N = 1e7; tic for n = 1:N % a=[n n;n n]/2; a = n/2; b...

2 months ago | 0 answers | 1

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Question

is it a bug?
The code below (i) does not produce an error message about not matching x and y; it can be explained by implicit expansion in ...

3 months ago | 2 answers | 0

### 2

Question

which way to call function is better?
I have more than hundred of input parameters in myfunc and I am using the following way to call the function after grouping the ...

3 months ago | 2 answers | 0

### 2

GUI: Can't access data from another callback function with handles
G A on 31 Aug 2019 at 8:38 Put the line guidata(hObject, handles); at the end of your function control_browse_button_Callbac...

3 months ago | 0

| accepted

How can I generate equal visual witdh bars with bar graph and log absciss scale ?
Instead of making the x-scale logarithmic by set(gca, 'xscale','log'), use linear x-scale and log10(Frequency) as X

5 months ago | 0

| accepted

Question

is it a bug?
In the following code, if view(2) or view(0,90) is defined before axis() which is not auto, then a default 3D figure will be plo...

5 months ago | 1 answer | 0

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Creating a contour plot of magnitude in 3D
Something like this? a=-1:0.1:1; b=-1:0.1:1; [X,Y]=meshgrid(a,b); Z=X.^2+Y.^2; M=[0.5 1]; hold on grid on surf(X,Y,Z), ...

5 months ago | 1

Question

is it a bug?
str2num('"abc"') ans = "abc"

5 months ago | 1 answer | 0

### 1

Not obtaining the right shape with matlab plot
Add a dot ./ in the line: si=atan(sin((N+1).*phi)./(R./r3-cos((N+1).*phi)));

5 months ago | 1

| accepted

Question

how can I do it without using eval
There are quite a few handles of uicontrols and uipanels named h1,h2...hN in my code exported by GUIDE. I want to create structu...

6 months ago | 1 answer | 0

### 1

Question

Is there the more elegant way to do this?
By trial and error I came to the following solution for choosing in my GUI a colormap and the number of colors to be used for my...

6 months ago | 1 answer | 0

### 1

Using Push Button to Export a String to an Edit Textbox (GUI)
set(handles.edit1,'String', Name); % Displaying my string "Name" into my Edit Textbox. Put this line in your pushbutton4_Callb...

6 months ago | 1

| accepted

Question

not documented in Matlab?
Both, ishandle(H) and ishghandle(H), are given in doc with only one input argument possibility, however ishghandle(H,'property...

6 months ago | 0 answers | 0

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Question

Two fields Tooltip and TooltipString duplicating each other.
I was playing with my GUI exported by GUIDE from fig-file and found that there are two fields in object properties containing th...

7 months ago | 1 answer | 0

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3d dimensional surface
v = [-2:0.1:2]; w = [-2:0.1:2]; [X,Y] = meshgrid(v,w); Z = 6*X.^2-4*X.^2.*Y.^2; figure(3); surf(X,Y,Z)

7 months ago | 1

How to combine plots on subplot?
figure(1) clf subplot(3,1,1) hold on plot(temp1,black1,'ko-'), plot(temp1,white1,'go-'), plot(temp1,pol1,'bo-'), plot(t...

7 months ago | 0

| accepted

How do I plot from multiple mfile into a same figure
Add "hold on" In your mfile2 anywhere before "plot(xfit,yfit)" : figure(2); %figure 2 hold on

7 months ago | 0

Low pass filtering in frequency domain
fft(x) usually returns a complex value. X_Mag = abs(fft(x)); - from here you are losing the information about the real and imagi...

7 months ago | 0

Need help plotting multiple graphs in one UIAxes
Your if-statement is returning only one option. Try the following way: function GraphbButtonPushed(app, event) x =...

7 months ago | 0

| accepted

I am trying to create a surface plot with nested loops and am getting the error "Z must be a matrix, not a scalar or vector."
Try something like the following (z must be a matrix): for m = 1:10 x(m) = m; for n = 1:10 y(n) = n; ...

8 months ago | 1

| accepted

Question

Is there the more elegant way to do this?
I would like to call arguments of function from a string or cell array. For example, this code works as I want: function te...

6 years ago | 2 answers | 0

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Question

Why Matlab is not changing the name of the GUI window?
The names of my fig-file and main m-file are, for example, |'Version15.fig'| and |'Version15.m'| , however, after executing thos...

6 years ago | 2 answers | 0

### 2

How to use the power operator in xlabel?
xlabel('A*R^{2/3}m^{8/3}')

6 years ago | 3

How to read complex number from a *.csv file?

6 years ago | 0

Solved

Swap the first and last columns
Flip the outermost columns of matrix A, so that the first column becomes the last and the last column becomes the first. All oth...

6 years ago

Solved

Column Removal
Remove the nth column from input matrix A and return the resulting matrix in output B. So if A = [1 2 3; 4 5 6]; and ...

6 years ago

Solved

Determine if input is odd
Given the input n, return true if n is odd or false if n is even.

6 years ago

Solved

Given a and b, return the sum a+b in c.

6 years ago

Solved

Fibonacci sequence
Calculate the nth Fibonacci number. Given n, return f where f = fib(n) and f(1) = 1, f(2) = 1, f(3) = 2, ... Examples: Inpu...

6 years ago

Solved

Select every other element of a vector
Write a function which returns every other element of the vector passed in. That is, it returns the all odd-numbered elements, s...

6 years ago