Hi coders! i'm facing a error. Error using contourf Z must be at least a 2x2 matrix.

Question

Mohd Babar 2024-8-19

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2146399-hi-coders-i-m-facing-a-error-error-using-contourf-z-must-be-at-least-a-2x2-matrix

评论： Mohd Babar 2024-8-22

clc;
clear all;
%-----Geometry,Number of simulations------%
d = 10;
N = 1000;
a11 = 250*(d/10);
a12= 100*(d/10);
%-----Mesh grid boundary definition--------%
xms=a11/2 - 2*(d);
xmf=a11/2 + 2*(d);
yms=a12/2 - 2*(d);
ymf=a12/2 + 2*(d);
%----------------Grid size----------------%
g = 0.085 ;
xq1=xms:g:xmf;
xq = xq1';
yq1=yms:g:ymf;
yq = yq1';
%-----Mesh gird around the hole----------%
[K1,K2] = meshgrid(xq, yq);
a= size(xq1,2);
b= size(yq1,2);
for k = 0:b
    for j=0:a
        e=((k*g)-2*d)^2+((j*g)-2*d)^2-(.5*d)^2;
        
        if e<0
            
            K1(j,k)=  NaN;
            K2(j,k)=  NaN;
        end
    end
end
zz1=0;
zz2= 0;
%----Importing files from abaqus---------%
for i =1:N
    fx =[ 'd:/babar/Abaqus/S2000/aax' num2str(i) '.txt'];
    fy =[ 'd:/babar/Abaqus/S2000/aay' num2str(i) '.txt'];
    fu =[ 'd:/babar/Abaqus/S2000/aau1' num2str(i) '.txt'];
    fv =[ 'd:/babar/Abaqus/S2000/aau2' num2str(i) '.txt'];
    
    x = textfile(fx);
    y = textfile(fy);
    z1 = textfile(fu);
    z2 = textfile(fv);
    U1 = griddata(x,y,z1,K1,K2);
    U2 = griddata(x,y,z2,K1,K2);
    
    
    zz1 = U1+zz1;
    zz2 = U2+zz2;
    i  ;
end
%--------Averaging the displacements-------%
zpk1 = (zz1)./N;
zpk2 = (zz2)./N;
xlswrite('zpk1.xlsx',zpk1)
xlswrite('zpk2.xlsx',zpk2)
%------Creating a strain matrix-----------%
E = zeros(2*(size(K1,1)-1),2*(size(K1,1)-1))
for j = 1: (size(K1,1)-1)
    for i = 1: (size(K1,1)-1)
        v = [zpk1(j,i);zpk2(j,i);zpk1(j,i+1);zpk2(j,i+1);zpk1(j+1,i+1);zpk2(j+1,i+1);zpk1(j+1,i);zpk2(j+1,i)];
        e1= strain1(v);
        e2= strain2(v);
        e3= strain3(v);
        e4= strain4(v);
        E((2*j-1),(2*i-1)) = e1(1);
        E((2*j-1),2*i) = e2(1);
        E(2*j,(2*i-1)) = e4(1);
        E(2*j,2*i) = e3(1);
    end
end
su = round(4*d/g)+1   ;
r = E((((su-1)- round(d/g)):-1:1),(su-1));
p = E((((su-1)- round(d/g)):-1:1),(su));
st = (p+r)./(1.5*(10)^(-4));
m = g*(size(r)-1);
H = 0:g:(m);
h = H./10;
writematrix(st)
type 'st.txt'
writematrix(h)
type 'h.txt'
plot(h,st)
xlim([0 1.5])
xlabel("X2/d",'fontsize',14)
ylabel("Normalised Strain along vertical path", 'fontsize',13)
legend("d/w = 0.5")
saveas(gcf,'plot.png')
contourf(st);
colorbar;
saveas(gcf, 'contour.png');
function E1 = strain1(v)
B1 = [1 0 0 0;0 0 0 1;0 1 1 0];
%% for node 1 
x1=-1/sqrt(3);eta1=-1/sqrt(3);
B21 = B2();
B31 = B3(x1,eta1);
B12 = B1*B21;
B = B12*B31;
E1 =B*v; 
end 
function E1 = strain2(v)
B1 = [1 0 0 0;0 0 0 1;0 1 1 0];
%% for node 1 
x1=1/sqrt(3);eta1=-1/sqrt(3);
B21 = B2();
B31 = B3(x1,eta1);
B12 = B1*B21;
B = B12*B31;
E1 =B*v; 
end 
function E1 = strain3(v)
B1 = [1 0 0 0;0 0 0 1;0 1 1 0];
%% for node 1 
x1=1/sqrt(3);eta1=1/sqrt(3);
B21 = B2();
B31 = B3(x1,eta1);
B12 = B1*B21;
B = B12*B31;
E1 =B*v; 
end 
function E1 = strain4(v)
B1 = [1 0 0 0;0 0 0 1;0 1 1 0];
%% for node 4
x1=-1/sqrt(3);eta1=1/sqrt(3);
B21 = B2();
B31 = B3(x1,eta1);
B12 = B1*B21;
B = B12*B31;
E1 =B*v; 
end 
function B21 = B2()
B21 = [0.05/0.0025 0 0 0;0 0.05/0.0025 0 0;0 0 0.05/0.0025 0;0 0 0 0.05/0.0025];
end 
function B31 = B3(x1,eta1)
B31 = [-(1-eta1)*0.25 0 (1-eta1)*0.25 0 (1+eta1)*0.25 0 -(1+eta1)*0.25 0;...
    -(1-x1)*0.25 0  -(1+x1)*0.25 0 (1+x1)*0.25 0 (1-x1)*0.25 0;...
    0 -(1-eta1)*0.25 0 (1-eta1)*0.25 0 (1+eta1)*0.25 0 -(1+eta1)*0.25;...
    0  -(1-x1)*0.25 0  -(1+x1)*0.25 0 (1+x1)*0.25 0 (1-x1)*0.25];
end
function value = textfile(filename)
fileID = fopen(filename, 'r');
if fileID == -1
    
    error('Failed to open file: %s', filename);clc;
    clear all;
    
    %-----Geometry,Number of simulations------%
    d = 10;
    N = 1000;
    a11 = 250*(d/10);
    a12= 100*(d/10);
    
    %-----Mesh grid boundary definition--------%
    xms=a11/2 - 2*(d);
    xmf=a11/2 + 2*(d);
    yms=a12/2 - 2*(d);
    ymf=a12/2 + 2*(d);
    
    %----------------Grid size----------------%
    g = 0.085 ;
    xq1=xms:g:xmf;
    xq = xq1';
    yq1=yms:g:ymf;
    yq = yq1';
    
    %-----Mesh gird around the hole----------%
    [K1,K2] = meshgrid(xq, yq);
    a= size(xq1,2);
    b= size(yq1,2);
    for k = 0:b
        for j=0:a
            e=((k*g)-2*d)^2+((j*g)-2*d)^2-(.5*d)^2;
            
            if e<0
                
                K1(j,k)=  NaN;
                K2(j,k)=  NaN;
            end
        end
    end
    zz1=0;
    zz2= 0;
    
    %----Importing files from abaqus---------%
    for i =1:N
        fx =[ 'd:/babar/Abaqus/S2000/aax' num2str(i) '.txt'];
        fy =[ 'd:/babar/Abaqus/S2000/aay' num2str(i) '.txt'];
        fu =[ 'd:/babar/Abaqus/S2000/aau1' num2str(i) '.txt'];
        fv =[ 'd:/babar/Abaqus/S2000/aau2' num2str(i) '.txt'];
        
        x = textfile(fx);
        y = textfile(fy);
        z1 = textfile(fu);
        z2 = textfile(fv);
        U1 = griddata(x,y,z1,K1,K2);
        U2 = griddata(x,y,z2,K1,K2);
        
        
        zz1 = U1+zz1;
        zz2 = U2+zz2;
        i  ;
    end
    
    %--------Averaging the displacements-------%
    zpk1 = (zz1)./N;
    zpk2 = (zz2)./N;
    
    
    xlswrite('zpk1.xlsx',zpk1)
    xlswrite('zpk2.xlsx',zpk2)
    
    %------Creating a strain matrix-----------%
    E = zeros(2*(size(K1,1)-1),2*(size(K1,1)-1))
    for j = 1: (size(K1,1)-1)
        for i = 1: (size(K1,1)-1)
            v = [zpk1(j,i);zpk2(j,i);zpk1(j,i+1);zpk2(j,i+1);zpk1(j+1,i+1);zpk2(j+1,i+1);zpk1(j+1,i);zpk2(j+1,i)];
            e1= strain1(v);
            e2= strain2(v);
            e3= strain3(v);
            e4= strain4(v);
            E((2*j-1),(2*i-1)) = e1(1);
            E((2*j-1),2*i) = e2(1);
            E(2*j,(2*i-1)) = e4(1);
            E(2*j,2*i) = e3(1);
        end
    end
    
    
    su = round(4*d/g)+1   ;
    r = E((((su-1)- round(d/g)):-1:1),(su-1));
    p = E((((su-1)- round(d/g)):-1:1),(su));
    st = (p+r)./(1.5*(10)^(-4));
    m = g*(size(r)-1);
    H = 0:g:(m);
    h = H./10;
    
    writematrix(st)
    type 'st.txt'
    writematrix(h)
    type 'h.txt'
    
    
    plot(h,st)
    xlim([0 1.5])
    xlabel("X2/d",'fontsize',14)
    ylabel("Normalised Strain along vertical path", 'fontsize',13)
    legend("d/w = 0.5")
    saveas(gcf,'plot.png')
    contourf(st);
    colorbar;
    saveas(gcf, 'contour.png');
    
    
    function E1 = strain1(v)
        B1 = [1 0 0 0;0 0 0 1;0 1 1 0];
        %% for node 1 
        x1=-1/sqrt(3);eta1=-1/sqrt(3);
        B21 = B2();
        B31 = B3(x1,eta1);
        B12 = B1*B21;
        B = B12*B31;
        E1 =B*v; 
    end 
    function E1 = strain2(v)
        B1 = [1 0 0 0;0 0 0 1;0 1 1 0];
        %% for node 1 
        x1=1/sqrt(3);eta1=-1/sqrt(3);
        B21 = B2();
        B31 = B3(x1,eta1);
        B12 = B1*B21;
        B = B12*B31;
        E1 =B*v; 
    end 
    function E1 = strain3(v)
        B1 = [1 0 0 0;0 0 0 1;0 1 1 0];
        %% for node 1 
        x1=1/sqrt(3);eta1=1/sqrt(3);
        B21 = B2();
        B31 = B3(x1,eta1);
        B12 = B1*B21;
        B = B12*B31;
        E1 =B*v; 
    end 
    function E1 = strain4(v)
        B1 = [1 0 0 0;0 0 0 1;0 1 1 0];
        %% for node 4
        x1=-1/sqrt(3);eta1=1/sqrt(3);
        B21 = B2();
        B31 = B3(x1,eta1);
        B12 = B1*B21;
        B = B12*B31;
        E1 =B*v; 
    end 
    
    
    function B21 = B2()
        B21 = [0.05/0.0025 0 0 0;0 0.05/0.0025 0 0;0 0 0.05/0.0025 0;0 0 0 0.05/0.0025];
    end 
    function B31 = B3(x1,eta1)
        B31 = [-(1-eta1)*0.25 0 (1-eta1)*0.25 0 (1+eta1)*0.25 0 -(1+eta1)*0.25 0;...
            -(1-x1)*0.25 0  -(1+x1)*0.25 0 (1+x1)*0.25 0 (1-x1)*0.25 0;...
            0 -(1-eta1)*0.25 0 (1-eta1)*0.25 0 (1+eta1)*0.25 0 -(1+eta1)*0.25;...
            0  -(1-x1)*0.25 0  -(1+x1)*0.25 0 (1+x1)*0.25 0 (1-x1)*0.25];
    end
    function value = textfile(filename)
        
        fileID = fopen(filename, 'r');
        if fileID == -1
            
            error('Failed to open file: %s', filename);
            
        end
        value = fscanf(fileID, '%f');
        fclose(fileID);
        
    end
    
    
    
    
    
end
value = fscanf(fileID, '%f');
fclose(fileID);
end

2 个评论
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Torsten 2024-8-19

在 MATLAB Online 中打开

    fx =[ 'd:/babar/Abaqus/S2000/aax' num2str(i) '.txt'];
    fy =[ 'd:/babar/Abaqus/S2000/aay' num2str(i) '.txt'];
    fu =[ 'd:/babar/Abaqus/S2000/aau1' num2str(i) '.txt'];
    fv =[ 'd:/babar/Abaqus/S2000/aau2' num2str(i) '.txt'];
    

We don't have access to your computer :-)

Voss 2024-8-19

@Mohd Babar: All of your functions are defined two times, once in the main script and once inside the textfile function - it looks like you accidentally copied your script into the textfile function.

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Answer 1

Voss 2024-8-19

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2146399-hi-coders-i-m-facing-a-error-error-using-contourf-z-must-be-at-least-a-2x2-matrix#answer_1501054

d and g are both scalars

d = 10;

% ...

g = 0.085 ;

so su is a scalar

su = round(4*d/g)+1 ;

so r and p are both column vectors

r = E((((su-1)- round(d/g)):-1:1),(su-1));

p = E((((su-1)- round(d/g)):-1:1),(su));

so st is a column vector

st = (p+r)./(1.5*(10)^(-4));

That is, su is of size n-by-1 for some n, but contourf requires the size of its argument to be p-by-q for some p>1, q>1. That's the reason for the error.