为什么从 Matlab 转换到 Scilab 时会出现 "wrong number of output arguments" 错误？

Question

我正在尝试将此 Matlab 代码转换为 Scilab，但我遇到了一些问题。

N = 101;
L = 4*pi;
x = linspace(0,L,N);
% It has three data set; 1: past, 2: current, 3: future.
u = zeros(N,3);
s = 0.5;
% Gaussian Pulse
y = 2*exp(-(x-L/2).^2);
u(:,1) = y;
u(:,2) = y;
% Plot the initial condition.
handle_line = plot(x,u(:,2),'LineWidth',2);
axis([0,L,-2,2]);
xlabel('x'); ylabel('u');
title('Wave equation');
% Dirichet Boundary conditions
u(1,:) = 0;
u(end,:) = 0;
filename = 'wave.gif';
for ii=1:100
    disp(['at ii= ', num2str(ii)]);
    u(2:end-1,3) = s*(u(3:end,2)+u(1:end-2,2)) ...
        + 2*(1-s)*u(2:end-1,2) ...
        - u(2:end-1,1);
    u(:,1) = u(:,2);
    u(:,2) = u(:,3);
    handle_line.YData = u(:,2);
    drawnow;
    frame = getframe(gcf);
    im = frame2im(frame);
    [A,map] = rgb2ind(im,256);
    if ii==1
           imwrite(A,map,filename,'gif','LoopCount',Inf,'DelayTime',0.05);
    else
        imwrite(A,map,filename,'gif','WriteMode','append','DelayTime',0.05);
    end
end

我收到此行的错误：

handle_line = plot(x,u(:,2),'LineWidth',2);

错误状态：输出参数的数量错误

我应该更改什么来修复它？

Answer 1

试试这个：

N = 101;
L = 4*pi;
x = linspace(0,L,N);
% It has three data set; 1: past, 2: current, 3: future.
u = zeros(N,3);
s = 0.5;
% Gaussian Pulse
y = 2*exp(-(x-L/2).^2);
u(:,1) = y;
u(:,2) = y;
% Define a standard plot range for x and y
x_range=[min(x) max(x)];
y_range=[-max(y) max(y)];
% Plot the initial condition.
plot(x,u(:,2),'LineWidth',2);
axis([0,L,-2,2]);
xlabel('x'); ylabel('u');
title('Wave equation');
% Dirichet Boundary conditions
u(1,:) = 0;
u(end,:) = 0;
filename = 'wave.gif';
for ii=1:100
    disp(['at ii= ', num2str(ii)]);
    u(2:end-1,3) = s*(u(3:end,2)+u(1:end-2,2)) ...
        + 2*(1-s)*u(2:end-1,2) ...
        - u(2:end-1,1);
    u(:,1) = u(:,2);
    u(:,2) = u(:,3);
    plot(x,u(:,2),'LineWidth',2);
    axis([x_range y_range]);
    frame = getframe(gcf);
    im = frame2im(frame);
    [A,map] = rgb2ind(im,256);
    if ii==1
           imwrite(A,map,filename,'gif','LoopCount',Inf,'DelayTime',0.05);
    else
        imwrite(A,map,filename,'gif','WriteMode','append','DelayTime',0.05);
    end
end

我去掉了输出，独立添加了axis limit

Answer 2

行

axis([0,L,-2,2]);

必须在 Scilab 中翻译成

set(gca(),"data_bounds",[0,L,-2,2]);

为什么从 Matlab 转换到 Scilab 时会出现 "wrong number of output arguments" 错误？

Why do i get "wrong number of output arguments" error when converting from Matlab to Scilab?

matlab

scilab