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Feeds
Regression Learner App. Model Performance
You are probably not doing anything wrong. The confusion comes from the fact that the Regression Learner App reports multiple pe...
2 days ago | 0
| accepted
How to ensurethat the sum([0.7 0.2 0.1])==1 return true when testing equivalence relation
"I think the error is caused by the floating number representation error, what is the best practice to compare two floating numb...
2 days ago | 2
| accepted
Command fscanf does not read zero
This looks correct to me: fid = fopen('test.txt','rt'); mat = fscanf(fid,'%f',[6,Inf]).' fclose(fid); For comprison: type t...
11 days ago | 0
datetime format with T time demarcation
dt1 = datetime(2023,8,1,11,07,56, "Format","yyyy-MM-dd'T'HH:mm:ss") dt2 = dt1 + minutes(1)
15 days ago | 0
When does distributing data improve computation time over overhead expense?
Let’s break your three questions down clearly. 1) Yes, syntactically and conceptually, your usage is correct. However, correctn...
16 days ago | 1
| accepted
Overwriting table columns with ()-indexing
I supect that the cause is consistency of behavior. Consider your example but not replacing the entire column, but only from one...
26 days ago | 1
| accepted
Why can't I use "end-2:end" for the meaning of last 2 columns?
"Why can't I use "end-2:end" for the meaning of last 2 columns?" Because that specifies the last three columns. The last two co...
27 days ago | 2
Possible to use box or violin plots, with unequal x and y axis spacing?
Horizontal, stats toolbox: x_positions = [1.2,3.5,7.8]; data = [ randn(50,1)+1; randn(50,1)+2; randn(50,1)+3 ]...
1 month ago | 0
| accepted
What is the main difference between matlab and simlink
MATLAB (MATrix LABoratory) is a programming language and computational environment. What it’s used for: Numerical computing D...
1 month ago | 1
| accepted
datestr returns erroneous result (MATLAB Version: 9.9.0.2037887 (R2020b) Update 8)
"When I provide datestr with a datenum produced by a format, it does not return the same value" It does when you provide the co...
1 month ago | 0
| accepted
How to set a tolerance?
The first rule of debugging: look at the data! data_1 = readmatrix('DataSet2_Test.txt') % much better than LOAD %Characterize ...
2 months ago | 0
| accepted
Unexpected size change when assigning a scalar to a 0x0 matrix using (:, :) indexing
As far as I can tell this behavior is not explicitly documented. The rule seem to be something like this: if and only if all non...
2 months ago | 1
| accepted
Introduction to Matrix inversion and finite element analysis. Is this code right?
Yes, the code looks correct. Here is a quick sanity-check of each key piece: DOF numbering is consistent throughout: node i own...
2 months ago | 1
persistent variable from previous run is not deleted during a new run of my .m file
MATLAB is not C. The tidiest way to avoid that ugliness is to use nested functions: https://www.mathworks.com/help/matlab/matla...
2 months ago | 2
How to find a rotation vector for use in rotate, if the rotation matrix is rank deficient?
You have two separate problems happening: Wrong solver for homogeneous systems: linsolve and lsqminnorm are for Ax=b with b~=0....
2 months ago | 0
| accepted
problem with patch fill color
After x_outer ends at r_max·cos(el_min), your lower_line_x starts at x_inner(1) = r_min·cos(el_min), creating an implicit jump a...
3 months ago | 1
How to print a line of text with multiple variables
%Initial Uncalibrated Meas. p_analog_uncal = [20,40,60,80,100,120]; dV_avg_uncal = [1.246378,1.500449,1.763329,2.015415,2.29...
3 months ago | 0
Using timeit() in the debugger causes function speedup until edits are made
This behaviour is almost certainly due to MATLAB's JIT (Just-In-Time) engine: https://blogs.mathworks.com/loren/2016/02/12/run-...
3 months ago | 1
Want to know the output format of audioread of .wav file captured by hydrophone
Short Answer: the default mode is normalized (dimensionless), NOT Volts or Pascals. MATLAB's audioread in default mode reads th...
3 months ago | 1
| accepted
How to correct the grouping variables in splitapply ?
The error is coming from this line: weightpercentages = [app.Callingapp.Osmotisk_data.Weight_percent_best_salt_1 app.Callingapp...
3 months ago | 0
| accepted
plsrectify the error in my code
The error occurs because READTABLE returns a table object, and you cannot extract the content from a table using parentheses lik...
3 months ago | 1
| accepted
Restarting background data acquisition when going back - multiple mlapp files
dpb has the right idea. Using an explicit polling loop (while/pause) to watch for the closure of the child screen adds unnecessa...
3 months ago | 1
| accepted
write different data types to excel sheet
"It appears to be stored as cell data" It is clearly stored as a string array: S = load('Variable.mat') S.line0 T = array2ta...
3 months ago | 1
Matrix 10x10 with same number in each row by column.
Method 1: REPMAT: M = repmat(1:10,10,1) Method 2: MTIMES: M = ones(10,1)*(1:10) Method 3: MAX M = max(zeros(10),1:10) Meth...
3 months ago | 2
| accepted
Trying to solve for a number of variables in a matrix. Getting a structfun error.
You have 9 equations but only 8 unknowns (u2–u9). Since u1=0 is already substituted in, MATLAB's solve sees an overconstrained s...
4 months ago | 0
Efficient overlapping block processing with nested sub blocks (similar to im2col with stride)
Your reshape/permute chain is working backwards: you're extracting in the "wrong" order and then correcting it. The cleaner appr...
4 months ago | 2
| accepted
Nested tiledlayout: can parent tiles have different widths depending on number of child tiles?
I don't think there is an automatic way to do this, but you could specify the TileSpan to achieve (approximately) equal sizes. ...
4 months ago | 0
Reading a string & sorting it into usable variables
Create demo file: writelines({'Layup: [45/-45/0/90/90/0/-45/45]','Ply thickness: [0.18/0.18/0.18/0.18/0.18/0.18/0.18/0.18]','El...
4 months ago | 0
How do I insert the comma marker for thousands into large numbers while printing to file or Command Line in MATLAB 7.7 (R2008b)?
Assuming that you have already converted to text: A = '1200387'; F = @(t) regexprep(t,'(?<!(\.|[eE][-+]?)\d*)\d{1,3}(?=(\d{3})...
4 months ago | 0
Inserting a 1000 separator
Assuming that you have already converted to text: A = '11201453.21'; F = @(t) regexprep(t,'(?<!(\.|[eE][-+]?)\d*)\d{1,3}(?=(\d...
4 months ago | 0
