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Problem with if and else and else

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joshua Abam
joshua Abam 2020-1-13
评论： joshua Abam 2020-1-14
Dear all,
I have a problem which i despiratly need an help with.
The idea I am think of is a suituation were if the first if statment is ok trhen the porgram stop however if the condition is not met, it moves to the next which i represent here with elseif and so on till the last elseif ststment.
Please I will appreaciate all contribution
if (0.04<=t_1/Do<0.05) % If condition
t_1 = Pd*di/(2*k*Fy) % Determine the minimum thickness
Do = di + 2*t_1 % Define the external diameter
elseif (0.04<=t_2/D1<0.05) % Elseif condition for the second round
t_2 = (Pd-Pe)*D1/2*k*Fy %Determine the minimum thickness
D1 = di + 2*t_2 %Define the external Diameter
elseif (0.04<=t_3/D2<0.05) %elseif condition for the final round
t_3 = D2/(((4*Fy)/(Y_sc*Ym*(Pd-Pe)*sqrt(3))) + 1) %Determine the minimum thickness
D2 = di + 2*t_3 %Define the external Diameter
end

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采纳的回答

David Hill
David Hill 2020-1-13
if 0.04<=t_1/Do&&t_1/Do<0.05 %need &&
t_1 = Pd*di/(2*k*Fy);
Do = di + 2*t_1;
elseif 0.04<=t_2/D1&&t_2/D1<0.05
t_2 = (Pd-Pe)*D1/2*k*Fy;
D1 = di + 2*t_2;
elseif 0.04<=t_3/D2&&t_3/D2<0.05
t_3 = D2/(((4*Fy)/(Y_sc*Ym*(Pd-Pe)*sqrt(3))) + 1);
D2 = di + 2*t_3;
end
  1 个评论
joshua Abam
joshua Abam 2020-1-14
Hi David,
sorry can you help by point me to the right direct as if statement is not giving the right answer
it borders on the same challenge
Thanks
to = Pli*di/(2*k*Fy) % Determine the minimum thickness
Do = di + 2*t_1 % Define the external diameter
0.04<=to/Do&&to/Do<0.05 % If condition
% if logical true disp(Do) and disp(to) ortherwise continue
t_2 = (Pli-Pe)*Do/2*k*Fy % Determine the minimum thickness
D_2 = di + 2*t_2 % Define the external Diameter
0.04<=t_2/D_2&&t_2/D_2<0.05 % Elseif condition for the second round
% if logical true disp(D_2) and disp(t_2) ortherwise continue
t_3 = Do/(((4*Fy)/(Y_sc*Ym*(Pli-Pe)*sqrt(3))) + 1) % Determine the minimum thickness
D_3 = di + 2*t_3 % Define the external Diameter
0.04<=t_3/D_3&&t_3/D_3<0.05 % elseif condition for the final round
% if logical true disp(D_3) and disp(t_3) ortherwise display not true
%and if logical true it should use in the next equation
%let say
x = D; %Let say D is the outcome from the logical statment
%That is now substituted into the equation below to below
% Bursting Criteria from Numerical Analysis of DNV-OS-F201
(Pli-Pe)*Y_sc*Ym - 4*f_min*(0.5*(x)-0.127)/(sqrt(3)*(x)-(0.5*(x)-0.127))<=0

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