what does thegrid{1}.points=(1:n); mean?

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Ronak
Ronak 2021-10-13
评论： Dave B 2021-10-28
Hello. I don't understand the underlined part. Can you please explain what is it doing?
thegrid=cell(1);
thegrid{1}.coordinate=zeros(p,1);
thegrid{1}.points=(1:n);
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Walter Roberson
Walter Roberson 2021-10-28
Could you clarify what this has to do with python (that you tagged with) ?

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回答（1 个）

Dave B
Dave B 2021-10-13
编辑：Dave B 2021-10-13
Cell arrays are containers for heterogenous data, each cell can hold arbitrary types/sizes/shapes. Cells are addressed with { }
The code creates a scalar cell array called grid
In the first (and only) cell in the grid, the code implicitly creates a struct. Structs are also containers that hold heterogenous data, but instead of indexing them by rows and columns it uses named fields. thegrid{1} has two fields: coordinate and points.
Inside thegrid{1}.coordinate theres a column of p zeros
Inside thegrid{1}.points are integers between 1 and n
Hope that helps, please let me know if you have more specific questions!
Cell arrays: https://www.mathworks.com/help/matlab/cell-arrays.html
Structs: https://www.mathworks.com/help/matlab/structures.html
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Ronak
Ronak 2021-10-27
编辑：Walter Roberson 2021-10-28
Hi. This is a part of the code that I wrote earlier. Can you please explain what is it doing here (Bold lines)? As far as I know it must remove gridpoints from thegrid and partitions gridpoints with a probability (prob). But I don't understand how it is doing the removing and patirioning.
for j=1:L
gridpoints=[gridpoints,thegrid{j}.coordinate];
npoints=length(thegrid{j}.points);
directions_numeric=sign(X_data(:,thegrid{j}.points)-thegrid{j}.coordinate*ones(1,npoints));
directions=num2cell(num2str(directions_numeric'),2);
numericmap=containers.Map(directions,num2cell(directions_numeric,1));
cubemap=containers.Map(directions,cell(npoints,1));
for i=1:npoints
cubemap(directions{i})=[cubemap(directions{i}),i];
end;
keyset=keys(cubemap);
valset=values(cubemap);
for i=1:length(cubemap)
activesize=length(valset{i});
if(activesize>gamma)
prob=1-0.5*exp(-epss*(activesize-gamma));
else
prob=0.5*exp(epss*(activesize-gamma));
end;
if(random('bino',1,prob)>0.5)
tempobj.coordinate=thegrid{j}.coordinate+side_length/2*numericmap(keyset{i});
tempobj.points=valset{i};
newgrid=[newgrid,tempobj];
end;
end;
Dave B
Dave B 2021-10-28
there are a lot of little expressions in there, can you clarify which part is confusing? A good tip in MATLAB is: start with one set of values (i.e. get out of the loop by setting i and j to be 1). break the code out into its statements (i.e. take each function one at a time), run them in the command window with no semicolon so you can see what the output is.

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