I want to rounding selected data with Looping and If else

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Michael Andersen
Michael Andersen 2023-5-8
评论： Stephen23 2023-5-9
I have workspace variable "a" which there is a 510x1 matrix data inside like this
I want to change cell containing 10+ only (like 10.0299, 10.0419, 10.0064,.......) change to be 10.0000. And this is my program code and I use rounding function to make 10,+ data change to be 10.0000
n=length(a);
for i=1:n
if(a > 0 & a < 10)
v=(round(a,0))
else
v=a
end
end
After I run the program, there is no change on "a" data (still like that picture), and if I switch "v=(round(a,0))" and "v=a" position and run it, all data in matrix are rounded like 9.0000; 10,0000;....... what's wrong with my code? thank you
  1 个评论
Stephen23
Stephen23 2023-5-9
" want to change cell containing 10+ only (like 10.0299, 10.0419, 10.0064,.......) change to be 10.0000"
The very simple and very efficient MATLAB approach:
a = min(10,a)
Any other code you can come up with will be slower and more complex than that.

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回答（2 个）

DGM
DGM 2023-5-8
编辑：DGM 2023-5-8
Ran in:
It's not really clear what the desired conditions are.
If what you want is to constrain values to the interval [0 10], you can do that like so:
A = [-1.2 1.2 8.5 12.5];
% using min(max())
B = min(max(A,0),10)
B = 1×4
0 1.2000 8.5000 10.0000
% or using imclamp() (attached)
B = imclamp(A,[0 10])
B = 1×4
0 1.2000 8.5000 10.0000
This keeps values inside the interval unchanged.
Both of these examples do the same thing. The only difference is that the latter is easier to read and less prone to mistakes.
If you only need a one-sided constraint, you can use min() by itself
VBBV
VBBV 2023-5-8
编辑：VBBV 2023-5-9
Ran in:
a = rand(1)*randi([5 25],510,1)
a = 510×1
5.4417 18.1391 18.1391 9.0696 8.1626 7.2557 10.8835 14.5113 16.3252 17.2322
n=length(a);
for i=1:n
if(a(i) > 0 & a(i) < 10)
a(i) = a(i);
else
a(i) = round(a(i),0);
end
end
a
a = 510×1
5.4417 18.0000 18.0000 9.0696 8.1626 7.2557 11.0000 15.0000 16.0000 17.0000
Use the round function shown as above.
  1 个评论
VBBV
VBBV 2023-5-8
Also, when you use a directly in the if-else condition , it refers to all elements in the vector at once.
You need to access individual elements one by one and then round them

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