storing unknown matrices size in a single matrix

2 次查看（过去 30 天）
ayman mounir
ayman mounir 2020-9-22
评论： ayman mounir 2020-10-5
Hello everyone,
I have a structure and I use strcmp(data.step(i).comment) to extract the matrices which have the number of student in every class.
example of my issue: I am storing the number of students in every class, Math Class=20 students, Bioology class=18 students and so on. (students number is not constant)
I want to write a code to store all matrices which have the students numbers in a single matrix or vector.
Thanks in advance.

请先登录，再回答此问题。

采纳的回答

Ameer Hamza
Ameer Hamza 2020-9-22
编辑：Ameer Hamza 2020-9-22
If you already have created variable names like that, then you need to concatenate them like this manually
matrix = [math_class, biology, other variables]
and remember to not do such thing again: https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval
  3 个评论
显示 1更早的评论
Ameer Hamza
Ameer Hamza 2020-9-22
Can you attach your data in a .mat file? It will help in understanding the problem.

请先登录，再进行评论。

更多回答（1 个）

Walter Roberson
Walter Roberson 2020-9-22
Use an array structure similar to
class_identifier1 student_id1
class_identifier1 student_id2
class_identifier1 student_id3
class_identifier2 student_id4
class_identifier2 student_id2 %that is, student2 is in both courses
so for any one course if you have a list of student identifiers, make it into a column vector, and make a column vector that is all the same, all the same class identifier; with this structure you can vertcat() the matrices to form one large matrix and yet still be able to distinguish which data came from which matrix.

类别

在 Help Center 和 File Exchange 中查找有关 Get Started with MATLAB 的更多信息

标签

产品


版本

R2019b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by