Community Profile

# Tommy

##### Last seen: Today
257 total contributions since 2017

View details...

Contributions in
View by

How to find the time of event?
For this sample matrix: >> matrix = [cumsum(10*rand(25,1)), rand(25,1) < 0.1] matrix = 2.6774 0 3.9889 ...

12 hours ago | 0

| accepted

How to check an array for its content?
It sounds like you want to make sure isnan and isempty do return 0. Also, there is no need to explicitly check if the result of ...

12 hours ago | 0

Reverse the Colormap of Surf plot
Grab the colormap and flip it upside down: f = figure; surf(peaks(50)) colormap(f, flipud(colormap(f))) colorbar

12 hours ago | 1

| accepted

Findpeaks: find the interpolation points for the width with the x axis
After you call findpeaks, you could obtain a handle to the current axes, find the handle(s) to the yellow horizontal line(s) whi...

13 hours ago | 0

How can i see if the value occurs in an array for the first time?

22 hours ago | 0

| accepted

How to count the number of "" true "" and ""false"" in matrix
How to show a message "True is 66.7%" fprintf('True is %.1f%%\n', 100*TRUES/numel(a));

22 hours ago | 0

"1D" scatter plot without x-axis
If you only have one-dimensional data but you want to display it on two axes, you'll have to tell MATLAB where (i.e. if you have...

1 day ago | 0

| accepted

Keyboard Function Not Responding
Add a drawnow before your pause(.01) to flush the graphics queue. Or use a longer pause, but of course that messes with the ani...

1 day ago | 0

"Invalid second data argument" error while using "plot" function (Lagrange Interpolation)
You are correct, it is complaining because pointy1 is a function handle. You can obtain the output of pointy1 when evaluated at ...

1 day ago | 1

| accepted

how to plot a vector
Vsw is a scalar, so nothing will show when you plot it. You are overwriting the value of Vsw in each loop of your for loop. Do y...

3 days ago | 1

cannot fill table with chars?
x=[1;2;3]; y=[4;5;6]; T=table(x,y); T.words = repmat({''}, 3, 1); % this creates a 3x1 cell array After these lines, T.words...

3 days ago | 0

| accepted

Plot: x axis and y axis values with commas as 1000 separators
You can format the tick labels using the TickLabelFormat property of the axis. For example: ax = axes('YScale','log'); plot(ax...

3 days ago | 0

| accepted

Saving data in a FOR loop
Does this work? n=2:50; b = zeros(numel(n),1); for i = 1:numel(n) a = (t_r>=Tvec(n(i))-dt/2) & (t_r<Tvec(n(i))+dt/2); ...

6 days ago | 0

| accepted

How can I export text and numeric data from excel to uitable (GUI element)
According to the docs, when you set the Data property of a uitable created with the figure function, you must set it to a numeri...

6 days ago | 0

cellfun vs. varfun applied to column of table
varfun passes entire variables from your table into your function. It calls your function once per table variable. The variable ...

7 days ago | 1

| accepted

rotate colorbar tick labels
You could place the labels yourself using text. Personally, I'd rather MATLAB figure out the placement. Here's code which puts ...

7 days ago | 0

transform fprintf in disp
Maybe this? disp(sprintf('\nPara i= %d\n e a= %f e a resposta Ã©: %f ', i, n, c)) You'll get a warning that fprintf is prefe...

7 days ago | 0

Adding Legend to a multiple graph within a loop
The legend should show after you call legend(), i.e.: clear all close all clc hold on data=dlmread('data.txt') for i= 1:27...

8 days ago | 0

| accepted

assume(x^2 == y) doesn't work
From the docs, "assume is not additive. Instead, it automatically deletes all previous assumptions on the variables in conditio...

8 days ago | 0

Histogram with adjusted bins to gaussian
If you'd like to fit a histogram to a normal distribution but you don't know the underlying data (e.g. you've altered the histog...

11 days ago | 0

MATLAB drawrectangle ROI custom wait function difficulty
Store the figure in h so that when you later call close(h), MATLAB knows what h is: h = figure(1);

12 days ago | 0

| accepted

How to edit grid lines on a 3D plot
It seems to me that Dillen.A's answer from your link is pretty elegant. Adapting that code to work with 3D axes: f = figure; ...

12 days ago | 0

Matlab Sort Command Output
How about this? x1=3; x2=1; x3=2; a=[x1 x2 x3]; varNames = {'x1','x2','x3'}; [~, idx] = sort(a); fprintf('Output:\n%s\n',...

13 days ago | 1

Compare elements from two matrix.

13 days ago | 0

| accepted

Subscript indices must either be real positive integers or logicals.
thetat=0:0.012566:0.6283; for idx = 1:numel(thetat) % use thetat(idx) to access the appropriate theta value in any iterati...

13 days ago | 0

| accepted

Value assignment to vector, without loop
Here's an option: N = 20; idx = (1:N)'; out = (idx >= frm & idx <= to)*value'; The indices in frm and to can't overlap, and ...

14 days ago | 1

| accepted

How do you display a users input into an questdlg command?
fprintf prints text to a file which corresponds to the supplied file ID or, if you don't supply a file ID, the command window (f...

14 days ago | 0

| accepted

How can i prevent the plots from appearing while still using them as frames for the movie function?
Plot your frames on a figure whose Visible property is set to 'off': fig = figure('Visible', 'off'); ax = axes(fig); x = lins...

15 days ago | 0

Vectors must be the same length with plot of Shear Force Diagram
If you look in the workspace, you should see that X has length 200 while V has length 101. If you want to plot V over X, they ne...

15 days ago | 0

| accepted