Multiple elseif command not working even when condition is true

%% in below code for Bita =0.3 and 0.1 and 0.2 and 0.6 it is not executing inside statement however for Bita=0.4 and 0.5 only it is working please reply

Alpha = input ('Enter the value of alpha layer from 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8 = ');

x= input ('Enter the value of gamma layer from 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8 = ');

Bita=1-Alpha-x;

if Bita == 0.1

Fx =0.2065*(x^2)-1.0425*(x)+0.9486;

Fxt =Fx*2326.2; %in Mpa IM7/8552 table 1.4 barbero pg.33

Fxc =-0.1508*(x^3) + 0.1658*(x^2) - 0.8379*(x) + 0.922;

Fxc =Fxc*1200.1; %in Mpa IM7/8552 table 1.4 barbero pg.33

Fxy=0.3524*(x)+.0884;

Fxy=Fxy*1200.1; %in Mpa IM7/8552 table 1.4 barbero pg.33

elseif Bita == 0.2

Fx =-0.2797*(x^2) - .607*(x)+ 0.8112;

Fxt =Fx*2326.2; %in Mpa

Fxc =44.032*(x^6) - 103.87*(x^5) + 94.683*(x^4) - 41.999*(x^3) + 9.3574*(x^2) - 1.716*(x)+ 0.8608;

Fxc =Fxc*1200.1; %in Mpa

Fxy=0.3524*(x)+.0884;Fxy=Fxy*1200.1; %in Mpa

elseif Bita == 0.3

disp(Bita)

Fx =-.8*(x)+.74; Fxc=Fx;

Fxt = Fx*2326.2; %in Mpa

Fxc = Fxc*1200.1; %in Mpa

Fxy=.3524*(x)+.0884;Fxy=Fxy*1200.1; %in Mpa

elseif Bita == 0.4

Fx =-.6*(x-.1)+.565; Fxc=Fx;

Fxt = Fx*2326.2; %in Mpa

Fxc = Fxc*1200.1; %in Mpa

Fxy=.3524*(x)+.0884;Fxy=Fxy*1200.1; %in Mpa

elseif Bita == 0.5

Fx = -.8*(x-.1)+.475; Fxc=Fx;

Fxt = Fx*2326.2; %in Mpa

Fxc = Fxc*1200.1; %in Mpa

Fxy=.3524*(x)+.0884;Fxy=Fxy*1200.1; %in Mpa

elseif Bita == 0.6

Fx =-.8*(x-.1)+.38; Fxc=Fx;

Fxt = Fx*2326.2; %in Mpa

Fxc = Fxc*1200.1; %in Mpa

Fxy=.3524*(x)+.0884;Fxy=Fxy*1200.1; %in Mpa

elseif Bita == 0.7

Fx =-.8*(x-.1)+.284; Fxc=Fx;

Fxt = Fx*2326.2; %in Mpa

Fxc = Fxc*1200.1; %in Mpa

Fxy=.3524*(x)+.0884;Fxy=Fxy*1200.1; %in Mpa

end

[Dhananjay Hiwase]

Please reply to above problem even when condition is true i.e Beta value is 0.3 , then also inside statements i.e formulas of Fxc ,Fx Fxy are not executed .

Answer 1

[DGM]

Beware strict equality tests when using floating point numbers. There are a few things you could try:

You could try to clean up the result in the hopes that it matches using an equality test:

Bita=round((1-Alpha-x)*10)/10;

Or the more robust approach is probably to test against a tolerance:

tol=1E-12;
if  abs(Bita-0.1)<tol
    % ...
elseif  abs(Bita-0.7)<tol
    % ...
else
    % figure out how to handle all other cases
end

And add a case to catch all other inputs

[Dhananjay Hiwase]

Instead of this Bita=1-Alpha-x;

using below

Bita=round((1-Alpha-x)*10)/10; suggested by you

solved my problem

thank you so much for reply

I gave much time on it earlier but was not able to figure it out

"Beware strict equality tests when using floating point numbers." will remember this

Answer 2

[VBBV]

%f 
if Bita <= 0.1 
....
.... 
elseif Bita > 0.1 & Bita <= 0.2 
....
.... 
elseif Bita > 0.2 & Bita <= 0.3 
....
....
end
% so on for other input values

Try this option

[VBBV]

%if true
 Bita=round(abs(1-Alpha-x),1); 
if Bita == 0.1000
....
.... 
elseif Bita == 0.2000
....
.... 
elseif Bita == 0.3000
....
....
end
% so on for other input values

The other option is round the value of Bita to single decimal units as shown at beginning

[Dhananjay Hiwase]

Thank you for reply

Bita=round((1-Alpha-x)*10)/10; this worked for me suggested by DGM, I hope this also will serve same purpose as of this suggested by you, Bita=round(abs(1-Alpha-x),1);

[Dhananjay Hiwase]

VBBV thank you I have accepted your answer also, as it has absolute command also, so in case if value goes negative it eill still work, but in my case value will not go negative.