how to give param value

how to give a,b,c,d,dt value to function

function [X1,Y1,Z1,W1] = Rossler4D(x,y,z,w,param)
a = param.a;
b = param.b;
c = param.c;
d = param.d;
dt= param.dt;
 

X1 = x + dt*(-y-z);
Y1 = y + dt*(x + a*y +w);
Z1 = z + dt*(b+x.*z);
W1 = w + dt*(-c.*z+d.*w);
end

%      a: 0.2500
%      b: 3
%      c: 0.5000
%      d: 0.0500
%     dt: 0.0025

Answer 1

[Walter Roberson]

param.a = 0.2500;
param.b = 3;
param.c = 0.5000;
param.d = 0.0500;
param.dt = 0.0025;

[X1,Y1,Z1,W1] = Rossler4D(x,y,z,w,param);

Or you could use

param = struct('a', 0.2500, 'b', 3, 'c', 0.5000, 'd', 0.0500, 'dt', 0.0025);
[X1,Y1,Z1,W1] = Rossler4D(x,y,z,w,param);

[juveria fatima]

@ Walter thank you, this is what i wanted to do.

[Ghofran Khaled]

could you help me please

my question here

https://ww2.mathworks.cn/matlabcentral/answers/1586514-how-can-i-create-improved-lorenz-mapping-code

Answer 2

[madhan ravi]

EDITED

Read https://www.mathworks.com/help/matlab/math/parameterizing-functions.html to better understand

x=-10;
y=-6;
z=0;
w=10;
a= 0.2500;
b= 3;
c= 0.5000;
d= 0.0500;
dt= 0.0025;
[X1,Y1,Z1,W1] = Rossler4D(x,y,z,w,a,b,c,d,dt)  %function call

function [X1,Y1,Z1,W1] = Rossler4D(x,y,z,w,a,b,c,d,dt) %this is how
X1 = x + dt*(-y-z);
Y1 = y + dt*(x + a*y +w);
Z1 = z + dt*(b+x.*z);
W1 = w + dt*(-c.*z+d.*w);
end

[madhan ravi]

see edited answer

[Ghofran Khaled]

Mr. Madhan could you help me please

my question here

https://ww2.mathworks.cn/matlabcentral/answers/1586514-how-can-i-create-improved-lorenz-mapping-code