How to take a value between two values
显示 更早的评论
hello, please help me.
i couldn't use "if" statement to take 'r' value. The 'r' value depends on 'd' value. but i don't know how to make the code for this.
lets take an example. when i input 'd' value as 15, the 'r' value that i got is 1.6 instead of 1.8. what should i do?
采纳的回答
kintali narendra
2023-9-15
0 个投票
make small changes in the if statement. The code given below is the right way to use if.
if (10.2 <= d) && (d < 13)
r = 1.6
elseif (13.5 <= d) && (d < 20.0)
r = 1.8
elseif (20.0 <= d) && (d < 22.4)
r = 2.0
end
5 个评论
Amron
2023-9-15
d = 21;
if (10.2 <= d) && (d < 13)
r = 1.6
elseif (13.5 <= d) && (d < 20.0)
r = 1.8
elseif (20.0 <= d) && (d < 22.4)
r = 2.0
end
This runs fine. I tried d = 11, 15, and 21. No error in any case. Is your d not a scalar, but a vector or matrix or some other kind of variable?
Amron
2023-9-15
Stephen23
2023-9-15
"how is the way to identify the property of a variable to know it is a scalar or not?"
isscalar(d)
Amron
2023-9-27
更多回答（2 个）
Steven Lord
2023-9-15
0 个投票
If you hover over the underlined <= operators in the code in the MATLAB Editor, you will see a Code Analyzer message explaining why that code doesn't do what you think it does and suggest how you can modify the code to do what you likely want to do.
Alternately, you could use the discretize function to discretize your data without a (potentially lengthy) if / elseif / elseif / elseif ... / end statement.
2 个评论
@Stephen23 like this -
d = randi([5 25],1,8)
X = [10.2,13,13.5,20,22.4];
Y = [1.6,1.8,2,Inf];
out = discretize(d,X,Y)
d = [11,15,21];
X = [10.2,13.5,20,22.4];
Y = [1.6,1.8,2,Inf];
Z = interp1(X,Y,d, 'previous')
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