Error: "filename" must be a string scalar or character vector.

Question

Jamie Al 2022-10-26

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1835718-error-filename-must-be-a-string-scalar-or-character-vector

编辑： VBBV 2022-11-5

I am trying to sort of creat an animation of a bunch of text files. The thing is, these text files are techically 3D matrices collapsed as 2D matrix and then I am reshaping them back to 3D to plot.

The code:

upperDir = 'C:\Users\J\Desktop\Folder\';
subDir = {'DataFile\'};  
Frame = 161; %number of text files
Nx = 64; 
Ny =64;  
Nz = 64; 
Lx =128; 
Ly = 128;  
Lz = 128; 
x   = (0:Nx-1)/Nx*2*pi;          
y   = (0:Ny-1)/Ny*2*pi;
z   = (0:Nz-1)/Nz*2*pi;
dx = Lx/Nx;
dy = Ly/Ny;
dz = Lz/Nz;
[X,Y,Z] = meshgrid(x,y,z);
for i = 1:Frame 
    %Test=reshape(readmatrix('Test161.txt'),64,64,64); 
    Test = reshape(readmatrix([upperDir  subDir 'n' num2str(i) '.txt']),64,64,64); %error here
    figure
    isosurface(X,Y,Z,Test);
    shading flat;
    grid on;
    xlabel('x(m)'); ylabel('y(m)'); zlabel('z(m)'); 
 
end

The error:

Error using readmatrix (line 157)
"filename" must be a string scalar or character vector.
Error in PlasmaCloud3DFourier (line 351)
    Test = reshape(readmatrix([upperDir  subDir 'n' num2str(i) '.txt']),64,64,64);