Answered
rlocfind returns error: Execution of script poly as a function is not supported
"Execution of script poly as a function is not supported" You have created a script named POLY. Rename that script. To find th...

2 years ago | 1

| accepted

Answered
Inverse Matrix for 6x6 matrix with variables
syms x y z A = [x,y,y,0,0,0; y,x,y,0,0,0; y,y,x,0,0,0; 0,0,0,z,0,0; 0,0,0,0,z,0; 0,0,0,0,0,z]; b = inv(A)

2 years ago | 0

Answered
Trouble with date conversion
Rather than fiddling around with text or numerics, just import the 2nd column as DATETIME right from the start: fnm = 'uurgeg_3...

2 years ago | 2

Answered
How to know exactly what row (or index number?) in a table based on user input?
Fake data: dt = datetime(2023,11,1:7).'; V = rand(7,1); T = table(dt,V) Date that you want: want = datetime(2023,11,4) Obt...

2 years ago | 0

Answered
Is there a way to dynamically use either brackets or curved bracket indexing depending on a variable?
"I understand it can be done with if statements but this will take up massive amounts of space in the code so I try to avoid it....

2 years ago | 2

| accepted

Answered
Do mex functions support keyword assignment syntax?
A few simple experiments show that key=value assignment is converted by the parser into 'key',value. I don't see why it would be...

2 years ago | 0

| accepted

Answered
Replacing values in a Matrix
A = [25,40,40,40,25,25,25,25,25,25; 25,40,40,40,40,25,25,25,25,25; 25,25,40,40,40,40,25,25,25,25; 25,25,40,40,40,40,40,25,25,25;...

2 years ago | 2

Answered
how convert string in struct with 0/1
S = struct('FS',{'Si','No','Si','Rank','No'}) Z = nan(size(S)); [X,Y] = ismember({S.FS},{'No','Si'}); Z(X) = Y(X)-1

2 years ago | 0

| accepted

Answered
How to assign a mean of a variable to every year ?
The simple and efficient MATLAB approach: DateYear = [2016;2016;2010;2008;2016;2016;2009;2008;2007;2010]; SeverityCode = [3;3;...

2 years ago | 1

Answered
Convert char to table
If you already have a character vector and the goal is to print it to file, then avoid the indirection of converting to numeric ...

2 years ago | 1

Answered
Readtable Returns "NaN" to the string type value if one column contains both number type and string type values
Use READCELL: C = readcell('test.csv') Everything that is text is text, everything that is numeric is numeric. Easy.

2 years ago | 0

| accepted

Answered
How can I improve my regular expressions?
Get rid of the look-behind expressions. They don't restrict which block of data is being read anyway. Also note that '.' matche...

2 years ago | 0

| accepted

Answered
Conditional Question Matlab Disagreement
"...but my teacher says it’s one and I’m super confused. Any explanation would be appreciated, thanks!" This code (6+3)>8>2 i...

2 years ago | 1

Answered
Extracting value from array
"For one value it does work, but not for all of them." It does work, your screenshot clearly informs us that you are getting on...

2 years ago | 0

| accepted

Answered
how to load all mat files in the filenumber wise sequentially ?
Follow this link and click the big DOWNLOAD button in the top right corner: https://www.mathworks.com/matlabcentral/fileexchang...

2 years ago | 1

| accepted

Answered
surf for n-dimensional cartesian matrix
Perhaps one of these: https://www.mathworks.com/help/images/ref/sliceviewer.html https://www.mathworks.com/help/images/ref/vol...

2 years ago | 0

Answered
Creating a new matrix from unique combinations in two other matrices
[A,B] = meshgrid(repelem(1:3,3),1:3) M = [reshape(A.',[],1),reshape(B.',[],1)]; [~,~,X] = unique(M,'rows','stable'); C = resh...

2 years ago | 0

| accepted

Answered
Reshape data the first row becomes the different columns
ID = [1;1;1;2;2;2]; Date = datetime(2015,1,[1;2;3;1;2;3]); vals = [0;0.5;-0.3;0;0.2;0.5]; T = table(ID,Date,vals) U = unstac...

2 years ago | 4

| accepted

Answered
Extract indices of vector?
X = find(B)

2 years ago | 0

| accepted

Answered
Error using readtable '.1(0a)' is not a recognized file extension. Unable to detect file type.
I strongly recommend avoiding forcing meta-data (e.g. filenames) into structure fields like that. To make your approach work wou...

2 years ago | 0

| accepted

Answered
I have error when i convert modified julian data to datetime
"how can i convert time_mjd to exact same date with time0?" The short answer is that you can't, simply because the limited prec...

2 years ago | 1

Answered
how can a symbolic derivative be vectorized automatically?
Use MATLABFUNCTION: syms a b c f = a*sin(b)*exp(c) df = diff(f,b) mf = matlabFunction(df) a=rand(10,1); b=rand(10,1); c=r...

2 years ago | 2

| accepted

Answered
loading multiple csv files using readmatrix
Use DIR: P = 'C:\My\Folder'; S = dir(fullfile(P,'*.csv')); for k = 1:numel(S) F = fullfile(P,S(k).name); S(k).data ...

2 years ago | 0

| accepted

Answered
3D Submatrices extraction by indexing the 3rd dimension
a_substruct.m1 = a_struct.m(:,:,endsWith(a_struct.i,'1')); a_substruct.m2 = a_struct.m(:,:,endsWith(a_struct.i,'2'));

2 years ago | 1

| accepted

Answered
How to call a variable from one program to another program 2 in app designer?
I am guessing that you actually require element-wise division, not matrix division: https://www.mathworks.com/help/matlab/matla...

2 years ago | 0

Answered
textscan gives empty cells?
url = 'https://www.cpc.ncep.noaa.gov/data/indices/sstoi.indices'; The best approach using READTABLE: tbl = readtable(url, 'Fil...

2 years ago | 1

| accepted

Answered
how two use winopen command with path assigned in a Variable?
winopen(MyPath) https://www.mathworks.com/help/matlab/matlab_prog/command-vs-function-syntax.html

2 years ago | 1

| accepted

Answered
Convert cell of mixed real and complex numbers into double
Without evil STR2NUM: C = {1.0000e-03,0;0,'10.06+28.21i'} M = str2double(C); X = isnan(M); M(X) = [C{X}]

2 years ago | 1

Answered
fsolve with 7 equations 6 unknowns: Error using vertcat Dimensions of arrays being concatenated are not consistent
f = @(x) [0.05*F*x(1) - x(5)*x(1)*F; 0.95*F*x(4) - (1-x(5))*x(4)*F; (y_ar)+(x(2) - x(4))+(x(1) - x(3)) - ... (((1...

2 years ago | 0

Answered
Indexing String Structure Fields
The basic problem is that you are attempting element-wise comparison of character vectors (of different sizes) using EQ. That wo...

2 years ago | 0