Set functions, returned "too many input arguments"
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I'm working on a worksheet for an aerodynamics class. It's not graded, but it helps with the next project. I'm attempting to calculate the graph of the pressure coefficient (c_p) for a given x/c using a theory in class. I have completed the derivations, but when I attempt to create the functions and solve them, MATLAB produces an error message: "Error using codename>@(x,y,b)ln((sqrt(x^2+(y-(b/2))^2)+(y-(b/2)))/(sqrt(x^2+(y+(b/2))^2)+(y+(b/2)))) Too many input arguments."
How would I fix this and get my code to run? I have attached the code below:
clear;
clc;
delta = 0.05;
c = 1;
b = 2;
x = 0:0.1:1;
y = 0:0.1:1;
z = 0;
u_inf = 10;
%incompressible pressure coefficient
fun1 = @(x,y,b) ln((sqrt(x^2 + (y-(b/2))^2)+(y-(b/2)))/(sqrt(x^2 + (y+(b/2))^2)+(y+(b/2))));
fun2 = @(x,y,b) ln((sqrt((x-(c/2))^2 + (y-(b/2))^2)+(y-(b/2)))/(sqrt((x-(c/2))^2 + (y+(b/2))^2)+(y+(b/2))));
fun3 = @(x,y,b) ln((sqrt((x-c)^2 + (y-(b/2))^2)+(y-(b/2)))/(sqrt((x-c)^2 + (y+(b/2))^2)+(y+(b/2))));
xc = (0:.01:1);
cpi = @(x,y,b) -delta/pi.*(fun1(x,y,0,b) - 2*fun2(x,y,.5,b) + fun3(x,y,1,b) );
plot(xc,cpi(xc,0,b));
%compressible
%M < 1
funa = @(x,y,z,u_inf,c,delta,y0) (u_inf*delta)/sqrt(((x-c).^2)+(y-y0).^2+z.^2);
funb = @(x,y,z,u_inf,c,delta,y0) -(u_inf*delta)/sqrt(x.^2+(y-y0).^2+z.^2);
func = @(x,y,z,u_inf,c,delta,y0) (-2*u_inf*delta)/sqrt(((x-c).^2)+(y-y0).^2+z.^2);
fund = @(x,y,z,u_inf,c,delta,y0) (-2*u_inf*delta)/sqrt(((x-(c/2)).^2)+(y-y0).^2+z.^2);
ua = integral(@(y0) funa(x,y,z,u_inf,c,delta),-b/2,b/2) - integral(@(y0) funb(x,y,z,u_inf,c,delta),-b/2,b/2);
ub = integral(@(y0) func(x,y,z,u_inf,c,delta),-b/2,b/2) - integral(@(y0) fund(x,y,z,u_inf,c,delta),-b/2,b/2);
u_tot = (1/(2*pi))*(ua + ub);
M = 0.6;
bet = sqrt(1-M^2);
cpc = @(x,y) cpi(x,y*bet,b*bet)/bet;
hold on
plot(xc,cpc(xc,0))
set(gca,'ydir','reverse')
xlabel('x/c')
ylabel('c_p')
采纳的回答
fun1, fun2, and fun3 each take three inputs:
fun1 = @(x,y,b) ln((sqrt(x^2 + (y-(b/2))^2)+(y-(b/2)))/(sqrt(x^2 + (y+(b/2))^2)+(y+(b/2))));
fun2 = @(x,y,b) ln((sqrt((x-(c/2))^2 + (y-(b/2))^2)+(y-(b/2)))/(sqrt((x-(c/2))^2 + (y+(b/2))^2)+(y+(b/2))));
fun3 = @(x,y,b) ln((sqrt((x-c)^2 + (y-(b/2))^2)+(y-(b/2)))/(sqrt((x-c)^2 + (y+(b/2))^2)+(y+(b/2))));
% ^ ^ ^
% 1 2 3
But you are giving them 4 inputs:
cpi = @(x,y,b) -delta/pi.*(fun1(x,y,0,b) - 2*fun2(x,y,.5,b) + fun3(x,y,1,b) );
% ^ ^ ^ ^ ^ ^ ^^ ^ ^ ^ ^ ^
% 1 2 3 4 1 2 3 4 1 2 3 4
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Steven Lord
2023-10-31
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