How to effectively assign values to different location in a TABLE?

Dear all, Pertaining to the above subject. I want to assign the elements in vector S to the TABLE at each of the locations as defined in the vector NUMS

nums =[5;6;7;12;13;14;16;17;18];
v1_threshold = 0.1:0.1:0.2;
table  = cell2table (repmat({nan},20,(numel(v1_threshold))));
S =[1,1,1,1,1,1,1,0,1];

The expected output in the TABLE should be something like

Table = {NaN;NaN;NaN;NaN;1;1;1;NaN;NaN;NaN;NaN;1;1;1;NaN;1;0;1;NaN;NaN} % Element in column 1 of TABLE

Table ={NaN;NaN;NaN;NaN;NaN;NaN;NaN;NaN;NaN;NaN;NaN;NaN;NaN;NaN;NaN;NaN;NaN;NaN;NaN;NaN} % Element in column 2 of TABLE

Initially, I thought the code should be something like

VV = num2cell (S);
for i =1:length (VV)
table (nums(i),1) = VV (i) ;
end

However, I am interested to know if there is a way to avoid the FOR loop?

I really appreciate if someone can show what I have been missing?

Answer 1

[Peter Perkins]

This question is really unclear. The best I can guess is that you want to assign S into specified rows of one variable in a table that's been pre-allocated with all NaN.

The first thing, as I said in at least one other thread, is that you should stay away from cell arrays. All you have are numbers.

The second thing is don't name one of your variables "table".

The following does what my best guess is at what you want:

>> i =[5;6;7;12;13;14;16;17;18];
>> S =[1,1,1,1,1,1,1,0,1];
>> t = array2table(nan(20,3));
>> t.Var1(i) = S
t =
  20×3 table
    Var1    Var2    Var3
    ____    ____    ____
    NaN     NaN     NaN 
    NaN     NaN     NaN 
    NaN     NaN     NaN 
    NaN     NaN     NaN 
      1     NaN     NaN 
      1     NaN     NaN 
      1     NaN     NaN 
    NaN     NaN     NaN 
    NaN     NaN     NaN 
    NaN     NaN     NaN 
    NaN     NaN     NaN 
      1     NaN     NaN 
      1     NaN     NaN 
      1     NaN     NaN 
    NaN     NaN     NaN 
      1     NaN     NaN 
      0     NaN     NaN 
      1     NaN     NaN 
    NaN     NaN     NaN 
    NaN     NaN     NaN

[balandong]

Hi Peter Thanks for your valuable time and suggestion. Your code work like a charm.

Just a follow-up question about good MATLAB practice. Is it recommended to store the result from intermediate calculation/ process into a matrix type double or cell. Then once all the calculation is complete, only then I convert it into table type. Or, it is better to store both the intermediate and final result in the Table type. Basically, I want the end matrix in Table type.

Thanks in advance for your time and wisdom

Answer 2

[Cong Ba]

%%copied from your question
nums =[5;6;7;12;13;14;16;17;18];
v1_threshold = 0.1:0.1:0.2;
table  = cell2table (repmat({nan},20,(numel(v1_threshold))));
S =[1,1,1,1,1,1,1,0,1];
VV = num2cell(S);

%%assign the column without using for loop
table(nums,1) = VV';

[balandong]

Hi Cong, I really appreciate the time spent entertaining this thread.

Your suggestion work well

Thank you