Keep matrix structure after indexing

2023 9 13
1 个回答
回答已采纳
更新时间：2023 9 14
3 次查看（30 天）

0 个投票

Hello,
I have a matrix temp with dimensions 609x881 and my logical index A with the same 609x881 dimension.
When I extract the temp value based on my index using this code
temp_idx = temp(A);
my result is the vector temp_idx with dimension 230x1.
Now, since my final goal is to produce a spatial plot if this data, how can I extract the temp value based on my index so that my final matrix temp_idx has the dimension 609x881 so that I have my temperature values where the index match and NaN's outside the index.
Hope the question is clear.
Please find attach .mat file of my variables
THANK YOU :)

请先登录，再回答此问题。

 采纳的回答

Stephen23
Stephen23 2023-9-13
编辑：Stephen23 2023-9-13

1 个投票

out = nan(size(temp));
out(A) = temp(A);
Or
out = temp;
out(~A) = NaN;

8 个评论
显示 6更早的评论 隐藏 6更早的评论

Carlotta Dentico
Carlotta Dentico 2023-9-13
Thank you! So just to be sure, my final matrix is temp?
Stephen23
Stephen23 2023-9-13
In my answer the output matrix is named out.
Carlotta Dentico
Carlotta Dentico 2023-9-13
Ok, so the matrix is all NaN's..
Stephen23
Stephen23 2023-9-13
Ran in:
Ran in:
"Ok, so the matrix is all NaN's.."
Nope. Lets check that right now:
A = load('A.mat').B
A = 609×881 logical array
Columns 1 through 49 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
temp = load('temp.mat').A
temp = 609×881
NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN
out = temp;
out(~A) = NaN;
[R,C] = find(~isnan(out))
R = 226×1
366 366 367 364 365 366 367 368 363 364
C = 226×1
364 365 365 366 366 366 366 366 367 367
Lets take a look around those indices:
out(360:370,360:370)
ans = 11×11
NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN -0.6407 NaN NaN NaN NaN NaN NaN NaN -0.5493 -0.5457 -0.5432 -0.5226 NaN NaN NaN NaN NaN NaN -0.5666 -0.5526 -0.5384 -0.5290 -0.5186 NaN NaN NaN NaN NaN NaN -0.5731 -0.5508 -0.5346 -0.5261 -0.5178 NaN NaN NaN NaN -0.5531 -0.5503 -0.5437 -0.5342 -0.5240 -0.5179 -0.5152 NaN NaN NaN NaN NaN -0.5314 -0.5242 -0.5153 -0.5102 -0.5045 -0.4996 NaN NaN NaN NaN NaN NaN -0.5092 -0.5086 -0.5114 -0.4913 -0.4542 NaN NaN NaN NaN NaN NaN NaN -0.4666 -0.4550 -0.4145 -0.3280
In fact there are
nnz(~isnan(out))
ans = 226
non-NaN values in the matrix out.
Another easy way to see the non-NaN values is to plot the data (NaNs are not plotted):
surf(out)
Carlotta Dentico
Carlotta Dentico 2023-9-13
yes! It works perfectly, I don't know why I had only NaN values.
If it'snot too much to ask, but what if I have to do the same operation but applied to my 'real' temp matrix which is 609x881x372 (where 372 os my time vector). so at the and I have my final matrix with the same dimensions (609x881x372) but only with the value matching the index
I tried using a loop, but I think something is not working..
for k = 1:372
temp(k) = pt_spatial_lev20(k);
out(k) = temp(k);
out(~A) = NaN;
end
Stephen23
Stephen23 2023-9-13
Is pt_spatial_lev20 an array or a function?
Stephen23
Stephen23 2023-9-14
I will assume that pt_spatial_lev20 has size 609x881x372, and A has size 609x881x1.
out = pt_spatial_lev20;
idx = repmat(A,1,1,size(out,3));
out(~idx) = NaN;

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