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**Content Feed**

Why does my plot not display when I use a nested loop?

If you want to get this as line plot, you'll need all values of a and c to be in one array each. If the example you have posted ...

6 years ago | 0

| accepted

Please help me how to describe a matrix in terms of smaller matrices.

Is it sure they overlap by one line/column? Then it's just A=[A11 A12(:,2:end);A21(2:end,:) A22(2:end,2:end)];

6 years ago | 0

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Selecting particular data range from matrix

No data is available and the code is not formatted. Please use the {}Code button for proper code formatting and please not only ...

6 years ago | 0

grouping values of 3 columns

Not clear what you mean: Do you want a numeric array or a string? If it's numeric, there's no 020 but only 20. If you want strin...

6 years ago | 0

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Counting number of 1's in different bins

histc can have two output parameters: [temp,ind] = histc(A,[100,200,300,400]); Use the second one as input parameter for...

6 years ago | 2

why do we need the analytic gradient in fmincon?

The algorithm applied (by default interior-point-algorithm, find details <http://www.mathworks.com/help/optim/ug/constrained-non...

6 years ago | 0

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Compare the contents to 2 subsystems within Simulink

I don't know what you mean with "subsystem", but if you have two variables with any kind of data (no matter if it's a struct or ...

6 years ago | 0

20 value from a normal distribution..

First, make sure that there are enough numbers available (with the values you use, this might not be a problem): lo=8;hi=3...

6 years ago | 0

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How to turn data from text file into cell array?

What is rows 2-18? Under the assumption that we can ignore them, just use textscan and take them as headerlines: >> fid=fo...

6 years ago | 0

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How can I save, close, and then reopen a Matlab file later so that I can resume at the same workspace when I closed the file?

What do you mean with closing the file? You can save the workspace with mat-files. save('matfile.mat') will save the current...

6 years ago | 0

MATRICES with customized sum for rows and columns

To get mat1, you can use the magic function: >> mat1=magic(4) mat1 = 16 2 3 13 5 1...

6 years ago | 0

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Find the total number of values between alimits

you were close: >> A= [1,2,3,4,5,6,7,8,9,10,11]; >> sum(A>3 & A<10) ans = 6

6 years ago | 1

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Concatenation of multiple variables into one variable

Assuming that the mat file contains _only_ these variables: data=cell2mat(struct2cell(load('filename.mat'))); meanvals=...

6 years ago | 0

how to eliminate the blank between subplot ?

Use the set command and the position property. Here is one example with zero spacing between the 2x2 axes and a 0.1 frame around...

6 years ago | 3

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Renaming an array in a script

I see two options. 1) You _know_ the names in advance (because they are all the same for every Excel file you open). Then, y...

6 years ago | 1

simple question function file syntax

You can use anonymous functions: f=@(x) sqrt((9.81*x)/0.25).*tanh(sqrt((9.81*0.25)./x)*4); Then, f(xr) will return the ...

6 years ago | 0

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Using ordered list for plotting charts

Your question is a bit unclear. Do you struggle with loading the data, with sorting the data or with plotting the data? Plus, wh...

6 years ago | 0

How to evaluate mean for column

You can use arrayfun: dx=zeros(100,1); dx(randi(100,10,1))=1; B=cumsum(dx); A=(1:100).^2; meanvals=arrayfun(@(x) me...

6 years ago | 0

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sum of rand matrix equal to zero

What kind of random distribution do you want? Here I use normal distribution, for other distributions just replace randn by the ...

6 years ago | 0

how to remove repeated Xtick values

I don't like the idea of labeling x=1 with "1/24" too much, but if you want to do this: You also need to set the xtick property:...

6 years ago | 1

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How to set LineStyle for matrix plotting?

It's not very intuitive, but that's the point (from <http://www.mathworks.com/help/matlab/creating_plots/defining-the-color-of-l...

6 years ago | 0

| accepted

Good way to import data file

If the format doesn't change through the file (such that after 10 s, suddenly also data about whatever appears), you can simply ...

6 years ago | 1

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Changing a row vector into a logical vector

If s is your stimulus array and t your time array and, let's say a value of s larger than 0.5 indicates this stimulus: s_l...

6 years ago | 1

change x axis, i have a plot of data from a headset. then i have 5 lines from a game, so i want 0-time from start(green) line till the end(red line), is it possible?

It's not quite clear what you want. 1) You want the x-axis to only go from the green line to the red line: xlim(Start,...

6 years ago | 0

Cut around the center of a matrix

If c indicates the range you want to remove and would be 3 in your example, just use B=A((end-c)/2+1:(end+c)/2,(end-c)/2+1...

6 years ago | 0

matrix loop how to extract data

What do you mean with "extract data"? You mean, instead of writing those 5 lines P1R=mean(P1); and so on, you want to do in a lo...

6 years ago | 0

Help with function main and writing cross product function

You have to decide if you want to name the output argument "w" or "result". If you change your second last line to w=[i j ...

6 years ago | 0

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splitting large cell array into smaller cell arrays

If you really want to have the inside to be a struct, you can go with c=cellfun(@(x) cell2struct(mat2cell(x,3*ones(7,1),20...

6 years ago | 0

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how to access cell array data with single for loop

You mean like for cnt=1:length(A) C=A{cnt}; D=B{cnt}; end Actually, there is no need for cell arrays here. In c...

6 years ago | 0