Matrix dimensions with sin(atan)

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Brandon Ormsby
Brandon Ormsby 2019-2-18
评论： Brandon Ormsby 2019-2-18
I think it is that the sin and atan functions are vectors that arent the same size. And also a plot window always pops up in the begining when i run my code.
here is the error:
Matrix dimensions must agree.
Error in HW16NACA (line 71)
UpperXF = xC-YThick.*sin(ThetaF);
clc;
clear;
close all;
format compact;
axis equal;
Choice = input('Pick an option by entering the number associated with it.\n1)Example NACA Airfoil\n2)Enter 4-digit NACA number\n3)Random NACA\n-->','s');
while length(Choice)~=1 | isnan(Choice) | str2double(Choice)~=1:3
Choice = input('Error: Not an option.\n\nPlease pick 1, 2, or 3.\n-->','s');
end
Choice = str2double(Choice);
TrailE = input('\nClosed Trailing Edge?\n1)Yes\n2)No\n-->','s');
while length(TrailE)~=1 | isnan(TrailE) | str2double(TrailE)~=1:2
TrailE = input('\nPlease only enter 1 or 2.\n-->','s');
end
if TrailE == 1
a4 = -0.1036;
else
a4 = -0.1015;
end
if Choice == 1
NNumb = int2str(2412);
end
M = str2double(NNumb(1))/100;
P = str2double(NNumb(2))/10;
xx = str2double(NNumb(end-1:end))/100;
a0 = 0.2969;
a1 = -0.126;
a2 = -0.3516;
a3 = -0.2843;
x=linspace(0,P);
CamberFY = (M/P^2)*(2*P.*x-x.^2);
GradientF = (2*M/P^2).*(P-x);
plot(x,CamberFY,'-g');
hold on;
x=linspace(P,1);
CamberBY = (M/(1-P)^2)*(1-2*P+2*P.*x-x.^2);
GradientB = (2*M/((1-P)^2)).*(P-x);
plot(x,CamberBY,'-g');
hold on;
x=0:1;
YThick = (xx/0.2)*(a0.*x.^0.5+a1.*x+a2.*x.^2+a3.*x.^3+a4.*x.^4);
pi = 3.1415926535;
B=linspace(0,pi);
xC = (1-cos(B))/2;
ThetaF = atan(GradientF);
ThetaB = atan(GradientB);
UpperXF = xC-YThick.*sin(ThetaF);
UpperXB = xC-YThick.*sin(ThetaB);
LowerXF = xC+YThick.*sin(ThetaF);
LowerXB = xC+YThick.*sin(ThetaB);
UpperYF = CamberFY+YThick.*cos(ThetaF);
UpperYB = CamberBY+YThick.*cos(ThetaB);
LowerYF = CamberFY-YThick.*cos(ThetaF);
LowerYB = CamberBY-YThick.*cos(ThetaB);
plot(UpperXF,UpperYF,':r');
plot(UpperXB,UpperYB,':g');
plot(LowerXF,LowerYF,'--r');
plot(LowerXB,LowerYB,'--g');
  2 个评论
Geoff Hayes
Geoff Hayes 2019-2-18
Brandon - the problem with
UpperXF = xC-YThick.*sin(ThetaF);
is that YThick is a 1x2 matrix and ThetaF (and so sin(ThetaF)) is a 1x100 matrix and so this multiplication will fail. Do these dimensions make sense for what the code is trying to do?
Brandon Ormsby
Brandon Ormsby 2019-2-18
okay i got no error this time and a graph by replacing line 80 with x=linspace(0,1); so 1x100=1x100
thank you!

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