For loop to extract every 3rd column out of matrix and assign as variable name
2 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
Anna M
el 24 de Jun. de 2019
Comentada: Anna M
el 2 de Jul. de 2019
I have a matrix that is 6001 x 72. I want to iterate through the matrix to extract every 3rd column, from 1:72, and assign it to a variable name, such as X1, X2,...,X24. How can I do this?
I have tried a for loop, but I keep getting error messages. I am a beginner in Matlab.
Thanks!
2 comentarios
Stephen23
el 25 de Jun. de 2019
Editada: Stephen23
el 25 de Jun. de 2019
"...assign it to a variable name, such as X1, X2,...,X24. How can I do this?"
Do NOT do this.
Accessing variable names is one way that beginners force themselves into writing slow, complex, buggy code that is hard to debug. Read these to know why:
You should use indexing. Inexing is neat, easy to debug, and very efficient.
Respuesta aceptada
James Tursa
el 24 de Jun. de 2019
Do not do this! This will only lead to headaches downstream in your code for processing these variables (you will need to use more eval( ) statements etc) and will be a nightmare to debug. There are much better alternatives. E.g.,
2 comentarios
infinity
el 25 de Jun. de 2019
Hello, Thank @James Tursa for mentioning this issuse of eval function.
I recommend @Anna M to refer these solutions.
Más respuestas (1)
infinity
el 24 de Jun. de 2019
Hello,
Here is an example that you can refer
for i = 1:24
v = genvarname(['X' num2str(i)]);
eval([v '= A(:,3*i);']);
end
where A is your matrix.
Ver también
Categorías
Más información sobre Matrix Indexing en Help Center y File Exchange.
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!