using relational operators on array and element

Question

David Weise 2019-10-7

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编辑： Stephen23 2019-10-9

Hy,

I'm trying to figure out a way to sort my experiment data. I have a list with values which I want to look at but first I need to delte the ones that don't fit my criteria. For this case I developed the following code:

%tolerance
x=1
%values
T1=5:-5:-15;
%values2
T2=30:5:55;
%values3
f=30:5:120;
%dimension
d=size(meassure);
d=d(1);
%applying tolerance to values I want to extract
var1=T1-x;
var2=T1+x;
%loop to check for criteria
for i=1:d
   if T(i,6)>=var1 & T(i,6)<=var2;
    else T(i,6)=NaN;

My problem now is, because var1 and var2 are arrays it puts NaN to every value. Even though one of the values fits the if.... criteria.

I hope someone can help me and I explained my problem well enough

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David Weise 2019-10-9

I know the basics of C and just learned some stuff about Matlab but not Python.

Stephen23 2019-10-9

编辑：Stephen23 2019-10-9

MATLAB is not very much like C.

The best way to learn basic MATLAB concepts is by working through the introdutory tutorials:

https://www.mathworks.com/help/matlab/getting-started-with-matlab.html

https://matlabacademy.mathworks.com/

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Answer 1

Daniel M 2019-10-7

1
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https://ww2.mathworks.cn/matlabcentral/answers/483997-using-relational-operators-on-array-and-element#answer_395157

在 MATLAB Online 中打开

if y>=var1 & y<=var2;

var1 = 4 -1 -6 -11 -16

var2 = 6 1 -4 -9 -14

Let's say y = 5, so the condition above will evaluate to

    ans =
  1×5 logical array
   1   0   0   0   0

How do you want the if statement to handle a logical array?

Perhaps you want to look into one of the following functions

   all()
   any()

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David Weise 2019-10-9

Thanks for your answer. I tried this now but not getting the right answers.

for i=1:d
    y=T(i,6)
    if y>=var1 & y<=var2
        if any(y==1)
    else T(i,6)=NaN
        end
    end
end

The code is running but doesn't change anything

Daniel M 2019-10-9

I'm not sure you understand how if statements work. You should read up on that.

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using relational operators on array and element

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