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If statement with multiple conditions

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Jacqueline Rigatto
Jacqueline Rigatto 2020-11-13
评论： Jacqueline Rigatto 2020-11-14
clear all; clc; close all
Tp=[4 7 11 16];
u= [0.188 0.368 0.628 0.997];
u10= [5.5 9.7 15 21];
ni_a=1.326*10^(-5);
sigma_p=2.*pi.*Tp.^(-1);
w2=((u.^2)./(ni_a.*sigma_p)).^(1.5);
r0=30:10:500;
SSGF = zeros(numel(Tp),numel(r0));
for Tp_Idx=1:length(Tp)
for r0_Idx=1:length(r0)
if Tp==4
if 30<=r0<75
SSGF=(7.84.*10.^(-3)).*r0.^(-1).*r0;
elseif 75<=r0<200
SSGF=4.41.*10.*(r0.^(-3)).*r0;
else
SSGF=(1.41.*10.^(13)).*r0.^(-8).*r0;
end
elseif Tp==7
if 30<=r0<75
SSGF=(7.84.*10.^(-3)).*r0.^(-1).*r0;
elseif 75<=r0<200
SSGF=4.41.*10.*(r0.^(-3)).*r0;
else
SSGF=(1.41.*10.^(13)).*r0.^(-8).*r0;
end
elseif Tp==11
if 30<=r0<75
SSGF=(7.84.*10.^(-3)).*r0.^(-1).*r0;
elseif 75<=r0<200
SSGF=4.41.*10.*(r0.^(-3)).*r0;
else
SSGF=(1.41.*10.^(13)).*r0.^(-8).*r0;
end
else
if 30<=r0<75
SSGF=(7.84.*10.^(-3)).*r0.^(-1).*r0;
elseif 75<=r0<200
SSGF=4.41.*10.*(r0.^(-3)).*r0;
else
SSGF=(1.41.*10.^(13)).*r0.^(-8).*r0;
end
end
end
end
Above is my code and my problem is that I am not able to make a matrix with 4 columns and 48 lines (SSGF). A piece of the table that was supposed to come out is in the image below.
Thanks in advance

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回答（2 个）

Walter Roberson
Walter Roberson 2020-11-13
if 30<=r0<75
means the same as
if ((30<=r0)<75)
The first part, 30<=r0, returns 0 (false) or 1 (true). Then you compare that 0 or 1 to 75.
You need to use &&
if 30 <= r0 && r0 < 75
Alan Stevens
Alan Stevens 2020-11-13
Don't forget the indices:
if Tp(Tp_Idx)==4
if 30<=r0(r0_Idx)<75
SSGF(Tp_Idx,r0_idx)=(7.84.*10.^(-3)).*r0(ro_Idx).^(-1).*r0(r0_Idx);
...etc.

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