Finding corresponding values between array

Hi, Suppose I have any matrix A(1,j) where j is columns

and t from 0:5:30

and for each value of t I have a corresponding j value

so e.g. t= 0 5 10 15 20 25 30

and j= 1 11 21 31..... corresponding to the t values.

How can I find an element within matrix A, corresponding to each of j values (columns)?

I've tried to do something like this so far,but it didnt work.

t=   0     5    10    15    20    25    30
j=  1     11    21    31..... 
v=length(t)
for k=1:v
y=A(1,J(v))
end

Answer 1

[Steven Lord]

I'm not certain I understand your question. Let's take a concrete example. Can you tell us what the answer you'd want to receive for this example is and how you calculated that answer?

t = 0:5:30;
j = 1:10:61;
A = (1:61).^2;

Is it as simple as indexing?

y = A(1, j)

y = 1×7

1 121 441 961 1681 2601 3721

results = table(t.', j.', y.', j.'.^2, ...
    'VariableNames', ["t", "j values", "y values", "j^2 to check"])

results = 7×4 table
    t     j values    y values    j^2 to check
    __    ________    ________    ____________

     0        1            1             1    
     5       11          121           121    
    10       21          441           441    
    15       31          961           961    
    20       41         1681          1681    
    25       51         2601          2601    
    30       61         3721          3721    

[JaffaCakes]

Hi, the problem is, I can't index like you've written because J is given by an equation (not as simple as the one i've shown here)

t=0:5:30
J=2*t+1 %j is given by an equation, would like to take these values of J and input into the matrix column
y=A(1,J) %gives an error saying, index exceeds matrix dimensions

[JaffaCakes]

Hi, nm I've sorted it out. Thanks for the help though