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**Content Feed**

Question

Defautl to open *.m files in MATLAB, linux

MATLAB R2020a, Ubuntu 20.04 I am trying to set MATLAB to open m files by default. MATLAB doesn't appear in the "Open with other...

3 years ago | 1 answer | 1

### 1

answerArray indices must be positive integers or logical values.

In the line: Pol4(n) = Cd0(0.5*1.225*q(n)*50)^2; what you wrote says to index Cd0 at 0.5*1.225*q(n)*50, which is probably not ...

3 years ago | 0

vector in a sting input

You need this syntax for string concatenation: B(i) = input( ['Node: ' num2str(i)], 's' ) or B(i) = input( sprintf('Node: %s...

3 years ago | 1

How can I change an xlsx file to a mat file?

Try using A = readmatrix('spreadsheet.xlsx') to get the data. See the documentation for help on that. Check that the data lo...

3 years ago | 1

Remove rows with less than certain amount of measurements from timetable

I have some idea about getting the times and unique times T = tab.Time uT = unique(T); and then checking how many times each ...

3 years ago | 0

| accepted

plotting three functions in the same graph with a specification

Your three function values fall in a range of orders of magnitude spanning 1e3 to 1e10. I think this code is the best visualizat...

3 years ago | 0

Submitted

fields2struct

fields2struct provides a clean but powerful way to initialize a structure

3 years ago | 1 download |

Datetime comparison near full hours

Don't bother splitting the time components yourself. t1 = datetime('9-mar-2020 16:00:00'); t0 = datetime('9-mar-2020 15:59:03'...

3 years ago | 2

| accepted

Extracting data from a signal

Adam, I think the crosshairs in the first image are where the derivative becomes positive: the signal starts to rise. I would us...

3 years ago | 1

How to add for loop in my code to get a table of result and plot it?

Yes, there are some problems with your for loop. But problems with density of states are fun! Remember, that when you say "for ...

3 years ago | 0

| accepted

I have to do a single index for the North

Instead of using find, to get the index, just use boolean indexing. This allows you to combine North1 and North2 with a logical ...

3 years ago | 0

| accepted

How to make an overlaying xy-grid?

Since your grid is symmetric, create a vector describing the mesh points along one dimension.Then use meshgrid grid to make matr...

3 years ago | 1

| accepted

no output when coding

Do this without a for loop % Load data a = xlsread('outdoorall.xlsx','H2:H52364'); b=xlsread('indoorall.xlsx','H2:H52364'); %...

3 years ago | 1

| accepted

checking dataType instead typecast at property or argument validation

Hi Florian, I recently learned this property validation as well, and its been working for me. Your syntax is backwards, if you...

3 years ago | 0

Detection of cracks on scissor's surface using Image processing.

Hafiz, This looks already like a very challenging problem. There is not any kind of built in crack detection code. It would be ...

3 years ago | 0

How to create a vector?

In MATLAB, create an array by wrapping the data in brackets time_vector = [1 2 3] creates a row vector. Read all about it her...

3 years ago | 0

Column of matrices for arbitrary N.

Hi Mike. The way you're building phi is creating a matrix, not a vector, since zeros(m,n) creates an mxn matrix. I think this ...

3 years ago | 1

| accepted

Elegantly refer to the second output from a function

I wrote two or three functions that allow me to do this. I agree, its much nicer to be able to one line certain values from buil...

3 years ago | 2

Index and remove values in a cell array

Its hard to see what the purpose of this deletion is. It looks like you have multiple (499) datasets described by ixv (some kind...

3 years ago | 0

Legend doesn't match my plot style

It looks like R1M1V1 is plotting three different curves. This could happen if max_time1 is a vector but R1M1V1 is a Nx3 matrix. ...

3 years ago | 1

Matlab mapping toolbox and the wmmarker function: how to change “description” from a web page to a file on the computer?

I found the answer! I stumbled across this https://blogs.mathworks.com/community/2007/07/09/printing-hyperlinks-to-the-command-...

3 years ago | 1

How can I smooth this plot?

A little more crudely than Strider's answer, since you may not have some of those functions in R2017... Here is a function that...

3 years ago | 0

How to generate and plot multiple semicircle with fixed endpoints but different radius

Thats a neat looking graphic. I don't really understand what its for though. Why don't you just manually draw in the straight li...

3 years ago | 0

Matlab mapping toolbox and the wmmarker function: how to change “description” from a web page to a file on the computer?

According to the documentation page on wmmarker, "Description elements can be either plain text or HTML markup." HTML links to l...

3 years ago | 0

| accepted

Can I store and call functions from within a struct?

To further this question, I would like to use fields of the struct as parameters in the functions, hopefully without having to w...

4 years ago | 0

Question

Dot indexing is not supported for variables of this type

Hello all. I have a very nice piece of GUI code I wrote. Recently, MATLAB crashed while I was writing the code and now when I t...

4 years ago | 1 answer | 0

### 1

answermatlab code for eigenvalue problem

Try simplifying the problem you're having instead of dumping equations. I went cross-eyed and I don't know what you want.

5 years ago | 0

Question

Is the brush tool still supported in R2017b, programatically?

I'm trying to find the best way for a user to interactively select a subset of data in a scatter plot that will then be polyfit ...

5 years ago | 1 answer | 0