How to write Subscript in MATLAB?
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Hello, So in my code i need to have subcripts in order to have multiple values of that varibale. I used the format given in matlab documents but still hvaing error
syms d_1 d_2 d_3 d_4 d_5 d_6 d_7 d_8 d_9 d_10 u_k a_i y_k y_(k-i)
A = [0.2867, -0.2428];
B = [0.6607 , -0.2732];
d_1 = 1;
v_k = d_1*u_k+d_2*u_k^2+d_3*u_k^3+d_4*u_k^4+d_5*u_k^5+d_6*u_k^6+d_7*u_k^7+d_8*u_k^8+d_9*u_k^9+d_10*u_k^10;
%yk formula
for k = 1:2
for i = 1:10
x = a_i*y_(k-i)
z = b_i(u_(k-i)+symsum(d_p*u^p(k-i),2, 10))
y_k = -x +z
end
end
Please help me out and let me know if the declaration of syms and the other varibales is wrong and how to correct it.
2 Comments
KALYAN ACHARJYA
on 24 Feb 2021
Edited: KALYAN ACHARJYA
on 24 Feb 2021
Problem is here y_(k-i) what exactly are you trying to do? Is it sys variable or sym function.
You can use y(k,i) as sym function directly.
Accepted Answer
Bhomik Kankaria
on 27 Feb 2021
Hi Ankitha,
Currently, MATLAB Live Editor displays symbolic variables with subscripts, superscripts, and accents in standard mathematical notation.
Hence you need to use live scripts to use the subscript functionality. Also live editor does not support naming the variable as y_(k-i) and will throw an error. You can use name like y_k_i etc. depending on the use case.
To see more examples of the variable names refer the below link-
2 Comments
ALFIE NELSON
on 20 Mar 2022
Edited: ALFIE NELSON
on 20 Mar 2022
Is there any way to create subscripts in the regulat editor and not the live editor? Or is there a way to publish on the live editor?
More Answers (2)
Steven Lord
on 20 Mar 2022
You don't need to explicitly create so many symbolic variables.
d = sym('d', [1 10])
y = sym('y', [1 2])
syms u_k a_i
A = [0.2867, -0.2428];
B = [0.6607 , -0.2732];
d(1) = 1;
v = d*u_k.^(1:10).'
Now work with v, d(someNumber), and y(someNumber) instead of trying to dynamically create variable names d_1, d_2, etc.
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