please guide me how to do if loop

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Saleh
Saleh 2022-10-18
评论： Walter Roberson 2022-10-18
hello i want to write in Matlab script that asks the user to enter a number between 1 to 3 If the user enters 1 it will show this graph below
inpt = "choose from 1 to 3 : ";
s = input(inpt);
k = 6 + 6;
size = 30 + 9;
t = linspace(-pi,pi,1000);
X = size * cos (k*t) .* cos(t);
Y = size * cos (k*t) .* sin(t);
plot(X,Y,'b*')
title('Matlab Flower')
If the user enters 2 it will show a table (( still i didn't complete it ))
If the user enters 3 it will show the Sinusoidal Graph
figure (1)
t=linspace(-pi/2,pi/2,1000);
X = 6*cos(2*pi*20*t) + 2*sin(2*pi*10*t);
plot(t,X, ‘r’)
title('Sinusoidal Graph')
and if the user inputs any other number ((more tnan 3 or below 1 )), they notice "You have picked invalid option" is displayed
please help me

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回答（1 个）

Walter Roberson
Walter Roberson 2022-10-18
while true
s = input(inpt);
check whether s is numeric scalar 1 2 or 3
if it is a valid choice
break;
end
give warning message
end
process the choice
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Saleh
Saleh 2022-10-18
what about , if the user inputs any other number ((more tnan 3 or below 1 )), they notice "You have picked invalid option" is displayed
please help me
Walter Roberson
Walter Roberson 2022-10-18
You put that code in where I wrote the outline "give warning message"
Most of what I wrote is outline. The literal parts are "while true" and "break"

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