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**Content Feed**

Need help making a plot from data in Excel with three columns and 2000 rows, to get two variables on the same axis.

Size of data is of no matter to syntax -- if you can plot a vector of 5 elements, you can plot one of thousands... data=readmat...

3 hours ago | 0

Fastest way to index large arrays

With the lookup arrays structured as they are, you don't need a lookup at all; you can just calculate the row directly -- fnRow...

6 hours ago | 0

organising data with fscanf

file=readlines(websave('data.txt','https://www.mathworks.com/matlabcentral/answers/uploaded_files/1145645/data.txt')); data=[];...

6 hours ago | 0

Code to import every 50th line of .csv isn't working

That's hard way to go about it -- data=readmatrix('Plain_VHB_Cyclic_Test_1.csv','numheaderlines',2); data=data(1:50:end,:);

7 hours ago | 0

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How to adjust the position of the x-axis ticks and put the angle degree on the values of the x-axis ticks?

With all values in one decade, log plot gets pretty squished; you can set the xlim to just cover the actual range and then only ...

8 hours ago | 0

Why can't i change an excel file sheets during a loop in matlab

Because in ewb.Worksheets.Item(1).Name =[Varlist(1,a)] ; that's exactly what you told it to do -- rename Item(1) each time. U...

12 hours ago | 0

Combine data from text files into 1?

Exact details for the easiest way to handle the three files would depend on how they're named/saved so as to keep the sets assoc...

15 hours ago | 0

Plot on Boxplot on the same graph

Shift/Rescale the hourly times to be centered about the 1:N values. boxplot(T) hold on W=0.8; % fractional width of eac...

16 hours ago | 0

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"Axis" function error

-3 < 0 despite abs(3) being greater -- as the error message says, the axis limits have to be in strictly ascending order numeric...

1 day ago | 0

How to extract row data by searching in matrix.

x=45; y=105; % lookup values; use variables, don't bury magic numbers in executable code ixy=(Species(:,3)==x)&(Species(...

1 day ago | 1

I would like to plot few values of a vector based on threshold setting from another vector.

It works; you just can't see the single point that is left because the single point on a default line width without a marker jus...

1 day ago | 1

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How to filter table rows according different conditions?

NHATS_table = readtable(file_name,"VariableNamingRule","preserve"); NHATS_table.Object=categorical(NHATS_table.Object); % c...

1 day ago | 1

How do I create x-axis in boxplot?

You've got the orientation of the array backwards to use boxplot effectively; it thinks columns are variables and rows observati...

3 days ago | 1

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Error using fgets Invalid file identifier. Use fopen to generate a valid file identifier. Error in fgetl (line 34) [tline,lt] = fgets(fid);

Indeed, just downloaded and unzipped into a clean subdirectory -- it isn't the failure to open ID.dat that you're seeing, it is ...

3 days ago | 0

extracting nonpivot columns from a matrix

function npc = nonpivotcols(A) [~,p]=rref(A); A(:,pcols)=[]; npc=A; end or function npc = nonpivotcols(A) [~,...

3 days ago | 0

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Check if number of changes from negative to positive on data table and perform set of conditional tests

A=[-5.67 0.999 -5.66 0.994 -5.55 1.024 -5.38 1.049 -5.19 1.065 -4.42 1.175 -3.00 ...

4 days ago | 0

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How to create a log_file.txt that stores my outputs and variables?

Use fid=fopen(fillfile('LogFileBaseLocation','LogFileName.txt','a+'); to open the file for append, read/write access. See fop...

4 days ago | 0

I cant seem to figure out how to plot my final answer theta-x axis and A,B,C in the y direction. all in 3 separate plots.

E1=40*10^3; E2=8*10^3; v12=0.25; G12=4*10^3; IsotropicComplianceStiffness(E1,E2,v12,G12); function [S,Q]= IsotropicCompli...

4 days ago | 0

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How do I make a probability plot of ranges of values below a certain threshold?

The Q? asked is ... t_delta = max(durations); % strange variable name??? n=histc(durations,1:t_delta); % counts by bi...

5 days ago | 1

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X axis tick labels

The x-axis is not numeric but a @doc:datetime Hmm...I thought they had made that a visible property (bells ringing, @Adam Danz ...

5 days ago | 0

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Error using horzcat Dimensions of arrays being concatenated are not consistent.

In the code section where you combine OBP_i and OBP OBP_i=0; OBP_b = cumsum([OBP_i OBP']); when you only consider a single co...

6 days ago | 0

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readstruct/writestruct changes boolean value true to "true"

Should be able to test this out on local machine... >> s.M1.Normal.enabled=true; % trial struct with logical variable >> s....

6 days ago | 1

| accepted

Weighted mean by groups

It's the wmean function definition that's doing it -- what you intended was wmean = @(w,v)mean(w.*v); trying that, id = { 'a'...

7 days ago | 0

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Error about preallocating for speed

a = []; y = 1; for T = 25:5:1000 D = 0.0062*exp(-80000/(8.31*T)); x(y) = 1/T; %error here a(y) = D; %error here...

7 days ago | 0

How can I add individual datapoints and connecting lines to grouped boxchart?

fn=websave('Data_example.xlsx','https://www.mathworks.com/matlabcentral/answers/uploaded_files/1136410/Data_example.xlsx'); tD=...

7 days ago | 0

When converting a .txt file to a matrix/cell, MATLAB merges some of the columns together.

C = readcell ('filename.txt'); writematrix ('filename.txt'); C ([1:40], :) =[]; % Delete rows 1-40 from the produced matrix (t...

7 days ago | 0

Scatter plot with mean for multiple groups

fn=websave('MATLAB_exampledata.xlsx','https://www.mathworks.com/matlabcentral/answers/uploaded_files/1136975/MATLAB_exampledata....

8 days ago | 0

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How to draw negative values on bar when it contains negative values

That's a little more tricky and the examples don't illustrate -- but it's not terribly difficult to fix; the problem is 'Vertica...

8 days ago | 0

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Stacked plot graphics, trying to color multiple lines on one y-axis.

OK, had just a few more minutes -- the real answer is that there's a 'LineProperties' handle under the stacked plot object handl...

9 days ago | 0

Drawing different coloured bar plots according to different conditions

Well, let's see if I parsed this correctly... data =[ 1 1 2 1 2 35 40 23 36 0 0 1...

9 days ago | 1

| accepted