error using the matrices to plot a graph

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Alina Abdikadyr
Alina Abdikadyr 2023-2-17
移动：Walter Roberson 2023-2-17
Hello everyone!
Could you please help me!
Error using .
To assign to or create a variable in a table, the number of rows must match the height of the table.
Error in tabular/addvars (line 184)
b = move(b).dotAssign(newvarnames{ii},varargin{ii}); % b.(newvarnames{ii}) = varargin{ii}
Error in untitled3 (line 85)
Table = addvars(Table, Vstall, 'After','V_p_min');
My code is:
clear all; close all
W = 10000;
S = 40;
AR=7;
cd0 = 0.005;
k = 1/pi/AR;
Psl=25000;
clalpha = 2*pi;
cdmin=4*cd0;
clmin=sqrt(3*cd0/k);
figure(1);hold on; xlabel('V');ylabel('P');
fun=@(n1) n1*W*(cdmin/clmin)*sqrt(2*n1*W/(1.225*S*clmin))-25000;
nmax = fzero(fun,2);
nmin=1/cos(0);
nv=nmin:0.1:2;
g=9.81;
%3.1
for k1 = 1:numel(nv)
n = nv(k1);
i=0;
for alpha = 1:0.25:12
i=i+1;
cl(i) = clalpha * alpha * pi/180;
V(i) = sqrt(2*n*W/1.225/S/cl(i));
cd(i) = cd0 + k * cl(i) * cl(i);
D(i) = n*W*cd(i)/cl(i);
P(i) = D(i)*V(i);
P_a(i)=Psl;
R(i)=V(i)*V(i)/(g*sqrt(n*n-1));
T(i)=2*pi*R(i)/V(i);
L(i)=0.5*1.225*V(i)*V(i)*S*cl(i);
n3(i)=L(i)/W;
end
c(k1,:) = V;
Pm(k1,:) = P;
Pma(k1,:) = P_a;
Rv(k1,:)=R;
Tv(k1,:)=T;
nk(k1,:)=n3;
xix = find(diff(sign(D.*V-P_a)));
if ~isempty(xix)
for k3 = 1:numel(xix)
idxrng = max(xix(k3)-1,1) : min(numel(V),xix(k3)+1);
xv(k3) = interp1(P(idxrng)-P_a(idxrng), V(idxrng), 0);
yv(k3) = interp1(V(idxrng),P(idxrng), xv(k3));
Xm{k1,k3} = xv(k3); % Intersection X-Matrix
Ym{k1,k3} = yv(k3); % Intersection Y-Matrix
end
end
figure(1); plot(V,P)
hold on
plot(V,P_a)
plot(xv, yv, 's', 'DisplayName',sprintf('Intersections %d',k1)) % Plot Intersections (Optional)
[minV,Vnidx] = min(V);
Vstall(k1,:) = minV;
Pstall(k1,:) = P(Vnidx);
nvv(:,k1)=nv;
[Pmin,idx] = min(P);
minP(k1,:) = Pmin;
Vm(k1,:) = V(idx);
N=nvv(:,1);
Vminp=Vm(:,1);
end
hold off
grid
figure(2)
plot(V, R, 'LineWidth',2, 'DisplayName','R(V)')
hold on
plot(c,Rv, 'DisplayName','Rv(c)')
hold off
grid
xlabel('V')
ylabel('R')
figure(3)
plot(T, R, 'LineWidth',2, 'DisplayName','R(V)')
hold on
plot(Tv,Rv, 'DisplayName','Rv(c)')
hold off
grid
xlabel('V')
ylabel('R')
% legend('Location','eastoutside')
Table = cell2table(cat(2,Xm,Ym), 'VariableNames',{'V_p_max','V_p_min','Pmax','Pmin'});
Table = addvars(Table, Vstall, 'After','V_p_min');
Table = addvars(Table, N, 'Before','V_p_max');
Table = addvars(Table, Pstall, minP,Vminp, 'After','Pmin');
Vpmin=[Vstall(1:8);cell2mat(Xm(9,2));cell2mat(Xm(10,2))];
Vpmax=cell2mat(Xm(:,1));
figure(4)
plot(Vpmax,N)
hold on
plot(Vpmin,N)
hold off
grid
xlabel('V')
ylabel('n')

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回答（2 个）

Kevin Holly
Kevin Holly 2023-2-17
Ran in:
The length of some of your columns didn't match up. Original table had 10 rows. Some of the new variables added to the table had 11 rows. I picked the first 10 values in the new variables and ran the code below:
W = 10000;
S = 40;
AR=7;
cd0 = 0.005;
k = 1/pi/AR;
Psl=25000;
clalpha = 2*pi;
cdmin=4*cd0;
clmin=sqrt(3*cd0/k);
figure(1);hold on; xlabel('V');ylabel('P');
fun=@(n1) n1*W*(cdmin/clmin)*sqrt(2*n1*W/(1.225*S*clmin))-25000;
nmax = fzero(fun,2);
nmin=1/cos(0);
nv=nmin:0.1:2;
g=9.81;
%3.1
for k1 = 1:numel(nv)
n = nv(k1);
i=0;
for alpha = 1:0.25:12
i=i+1;
cl(i) = clalpha * alpha * pi/180;
V(i) = sqrt(2*n*W/1.225/S/cl(i));
cd(i) = cd0 + k * cl(i) * cl(i);
D(i) = n*W*cd(i)/cl(i);
P(i) = D(i)*V(i);
P_a(i)=Psl;
R(i)=V(i)*V(i)/(g*sqrt(n*n-1));
T(i)=2*pi*R(i)/V(i);
L(i)=0.5*1.225*V(i)*V(i)*S*cl(i);
n3(i)=L(i)/W;
end
c(k1,:) = V;
Pm(k1,:) = P;
Pma(k1,:) = P_a;
Rv(k1,:)=R;
Tv(k1,:)=T;
nk(k1,:)=n3;
xix = find(diff(sign(D.*V-P_a)));
if ~isempty(xix)
for k3 = 1:numel(xix)
idxrng = max(xix(k3)-1,1) : min(numel(V),xix(k3)+1);
xv(k3) = interp1(P(idxrng)-P_a(idxrng), V(idxrng), 0);
yv(k3) = interp1(V(idxrng),P(idxrng), xv(k3));
Xm{k1,k3} = xv(k3); % Intersection X-Matrix
Ym{k1,k3} = yv(k3); % Intersection Y-Matrix
end
end
figure(1); plot(V,P)
hold on
plot(V,P_a)
plot(xv, yv, 's', 'DisplayName',sprintf('Intersections %d',k1)) % Plot Intersections (Optional)
[minV,Vnidx] = min(V);
Vstall(k1,:) = minV;
Pstall(k1,:) = P(Vnidx);
nvv(:,k1)=nv;
[Pmin,idx] = min(P);
minP(k1,:) = Pmin;
Vm(k1,:) = V(idx);
N=nvv(:,1);
Vminp=Vm(:,1);
end
hold off
grid
figure(2)
plot(V, R, 'LineWidth',2, 'DisplayName','R(V)')
hold on
plot(c,Rv, 'DisplayName','Rv(c)')
hold off
grid
xlabel('V')
ylabel('R')
figure(3)
plot(T, R, 'LineWidth',2, 'DisplayName','R(V)')
hold on
plot(Tv,Rv, 'DisplayName','Rv(c)')
hold off
grid
xlabel('V')
ylabel('R')
% legend('Location','eastoutside')
Table = cell2table(cat(2,Xm,Ym), 'VariableNames',{'V_p_max','V_p_min','Pmax','Pmin'})
Table = 10×4 table
V_p_max V_p_min Pmax Pmin _______ ____________ _____ ____________ 56.013 {0×0 double} 25000 {0×0 double} 55.393 {0×0 double} 25000 {0×0 double} 54.744 {0×0 double} 25000 {0×0 double} 53.814 {0×0 double} 25000 {0×0 double} 52.812 {0×0 double} 25000 {0×0 double} 51.635 {0×0 double} 25000 {0×0 double} 50.199 {0×0 double} 25000 {0×0 double} 48.415 {0×0 double} 25000 {0×0 double} 45.973 {[ 26.4556]} 25000 {[ 25000]} 41.874 {[ 31.8353]} 25000 {[ 25000]}
size(Table)
ans = 1×2
10 4
size(Vstall)
ans = 1×2
11 1
Vstall
Vstall = 11×1
17.6116 18.4712 19.2925 20.0803 20.8383 21.5697 22.2771 22.9627 23.6284 24.2759
addvars(Table, Vstall(1:10), 'After','V_p_min');
addvars(Table, N(1:10), 'Before','V_p_max');
addvars(Table, Pstall(1:10), minP(1:10),Vminp(1:10), 'After','Pmin');
Table
Table = 10×4 table
V_p_max V_p_min Pmax Pmin _______ ____________ _____ ____________ 56.013 {0×0 double} 25000 {0×0 double} 55.393 {0×0 double} 25000 {0×0 double} 54.744 {0×0 double} 25000 {0×0 double} 53.814 {0×0 double} 25000 {0×0 double} 52.812 {0×0 double} 25000 {0×0 double} 51.635 {0×0 double} 25000 {0×0 double} 50.199 {0×0 double} 25000 {0×0 double} 48.415 {0×0 double} 25000 {0×0 double} 45.973 {[ 26.4556]} 25000 {[ 25000]} 41.874 {[ 31.8353]} 25000 {[ 25000]}
Vpmin=[Vstall(1:8);cell2mat(Xm(9,2));cell2mat(Xm(10,2))];
Vpmax=cell2mat(Xm(:,1));
figure(4)
plot(Vpmax,N(1:10))
hold on
plot(Vpmin,N(1:10))
hold off
grid
xlabel('V')
ylabel('n')
Walter Roberson
Walter Roberson 2023-2-17
移动：Walter Roberson 2023-2-17
Ran in:
You test if ~isempty(xix) and do not assign to Xm{k1,:} or Ym{k1,:} in that case. That can lead to empty cells if it happens in the middle of the run, or can lead to Xm and Ym being shorter if it happens at the end of a run. Either way, if it happens, when you cell2mat() the result is not going to be as large as the other variables.
clear all; close all
W = 10000;
S = 40;
AR=7;
cd0 = 0.005;
k = 1/pi/AR;
Psl=25000;
clalpha = 2*pi;
cdmin=4*cd0;
clmin=sqrt(3*cd0/k);
figure(1);hold on; xlabel('V');ylabel('P');
fun=@(n1) n1*W*(cdmin/clmin)*sqrt(2*n1*W/(1.225*S*clmin))-25000;
nmax = fzero(fun,2);
nmin=1/cos(0);
nv=nmin:0.1:2;
g=9.81;
%3.1
for k1 = 1:numel(nv)
n = nv(k1);
i=0;
for alpha = 1:0.25:12
i=i+1;
cl(i) = clalpha * alpha * pi/180;
V(i) = sqrt(2*n*W/1.225/S/cl(i));
cd(i) = cd0 + k * cl(i) * cl(i);
D(i) = n*W*cd(i)/cl(i);
P(i) = D(i)*V(i);
P_a(i)=Psl;
R(i)=V(i)*V(i)/(g*sqrt(n*n-1));
T(i)=2*pi*R(i)/V(i);
L(i)=0.5*1.225*V(i)*V(i)*S*cl(i);
n3(i)=L(i)/W;
end
c(k1,:) = V;
Pm(k1,:) = P;
Pma(k1,:) = P_a;
Rv(k1,:)=R;
Tv(k1,:)=T;
nk(k1,:)=n3;
xix = find(diff(sign(D.*V-P_a)));
if ~isempty(xix)
for k3 = 1:numel(xix)
idxrng = max(xix(k3)-1,1) : min(numel(V),xix(k3)+1);
xv(k3) = interp1(P(idxrng)-P_a(idxrng), V(idxrng), 0);
yv(k3) = interp1(V(idxrng),P(idxrng), xv(k3));
Xm{k1,k3} = xv(k3); % Intersection X-Matrix
Ym{k1,k3} = yv(k3); % Intersection Y-Matrix
end
else
fprintf('xix empty for k1 = %d\n', k1);
end
figure(1); plot(V,P)
hold on
plot(V,P_a)
plot(xv, yv, 's', 'DisplayName',sprintf('Intersections %d',k1)) % Plot Intersections (Optional)
[minV,Vnidx] = min(V);
Vstall(k1,:) = minV;
Pstall(k1,:) = P(Vnidx);
nvv(:,k1)=nv;
[Pmin,idx] = min(P);
minP(k1,:) = Pmin;
Vm(k1,:) = V(idx);
N=nvv(:,1);
Vminp=Vm(:,1);
end
xix empty for k1 = 11
hold off
grid
figure(2)
plot(V, R, 'LineWidth',2, 'DisplayName','R(V)')
hold on
plot(c,Rv, 'DisplayName','Rv(c)')
hold off
grid
xlabel('V')
ylabel('R')
figure(3)
plot(T, R, 'LineWidth',2, 'DisplayName','R(V)')
hold on
plot(Tv,Rv, 'DisplayName','Rv(c)')
hold off
grid
xlabel('V')
ylabel('R')
% legend('Location','eastoutside')
Table = cell2table(cat(2,Xm,Ym), 'VariableNames',{'V_p_max','V_p_min','Pmax','Pmin'});
whos Xm Ym Table Vstall N Pstall minP Vminp
Name Size Bytes Class Attributes N 11x1 88 double Pstall 11x1 88 double Table 10x4 2379 table Vminp 11x1 88 double Vstall 11x1 88 double Xm 10x2 1408 cell Ym 10x2 1408 cell minP 11x1 88 double
Table = addvars(Table, Vstall, 'After','V_p_min');
Error using .
To assign to or create a variable in a table, the number of rows must match the height of the table.

Error in tabular/addvars (line 184)
b = move(b).dotAssign(newvarnames{ii},varargin{ii}); % b.(newvarnames{ii}) = varargin{ii}
Table = addvars(Table, N, 'Before','V_p_max');
Table = addvars(Table, Pstall, minP,Vminp, 'After','Pmin');
Vpmin=[Vstall(1:8);cell2mat(Xm(9,2));cell2mat(Xm(10,2))];
Vpmax=cell2mat(Xm(:,1));
figure(4)
plot(Vpmax,N)
hold on
plot(Vpmin,N)
hold off
grid
xlabel('V')
ylabel('n')

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