How to plot all rows of an array with a random color

Hello there,

i am working on I-V charchteristics of a mosfet script

My Proplem is : i need to plot all the rows of the generated array called current2 " Dynamic Size " => depends on user inputs

and i need it to be in a random color for each line

+

How to generate a keymap to read the plot ?

sample input :

1- mobility of electrons : 80

2- thickness of oxide : 10.5*10^-8

3- W/L : 2

4 threshold voltage : 0.3

5- vgs = 0 - 1 - 10

output will be like this

this is the script :

% Long-Channel I-V Characteristics

clc

clear all

%Mobility of Electrons

un=input('Please enter the mobility of electrons ( c𝑚2/𝑉s ) : ');

disp('------------------------------------------------------')

%Thickness of Oxide

tox = input('Please enter the thickness of oxide ( meter ) : ');

disp('------------------------------------------------------')

%The Ratio Between Width & Length of Transistor

w_L=input('Please enter the value of W / L : ');

disp('------------------------------------------------------')

%Threshold Voltage

Vth=input('Please enter the threshold voltage ( volt ) :');

disp('------------------------------------------------------')

%vgs=input('Please enter the Vgs value in volts : ');

vgsstart =input('Please Define the start of Vgs values : ');

disp('------------------------------------------------------')

vgsstep =input('Please Define the step between each value of Vgs values : ');

disp('------------------------------------------------------')

vgsend =input('Please Define the end of Vgs values : ');

%Sweep drain to source voltge from vdsstart to vdsend & each step is vdsstep

vds=vgsstart:vgsstep:vgsend;

%Defining the Vgs Values

vgs=vgsstart:vgsstep:vgsend;

%calculating cox & un*cox "kn"

cox=3.9*8.854*10^-14/tox;

kn=un*cox;

%calculating Beta

beta=kn*w_L;

%Estimate length of the array Vds

m=length(vds);

%Estimate length of the array Vgs

n=length(vgs);

%Calulating Ids

for x=1:n

for i=1:m

%Cutoff Region

if vgs(x) < Vth

current2(x,i)=0;

%Linear Region

elseif vds(i) < (vgs(x) - Vth)

current2(x,i)=beta*((vgs(x)-Vth)*vds(i) - 0.5*(vds(i)^2));

%Saturation Region

elseif vds(i) >= (vgs(x) - Vth)

current2(x,i)=0.5* beta * ((vgs(x) - Vth)^2);

end

end

end

%Plotting the I-V Characteristics

plot(vds,current2(2,:),'y',vds,current2(3,:),'b',vds,current2(4,:),'g',vds,current2(5,:),'r')

xlabel('Vds, V')

ylabel('Ids,A')

title('Ids-Vds Characteristics of a N-Mos')

Answer 1

[Image Analyst]

If you want a random color for each line, get a random color (1 1-by-3 array between 0 and 1) for each line

for k = 2 : 5
    plot(vds,current2(k,:), '-', 'Color', rand(1, 3), 'LineWidth', 3);
    hold on;
end
hold off;

If you want specific colors

myColors = {'k', 'r', 'g', 'b', [0.4, 0.2, 0.7], 'm'}; % Specify specific colors
for k = 2 : 5
    plot(vds,current2(k,:), '-', 'Color', myColors{k}, 'LineWidth', 3);
    hold on;
end
hold off;

[Muhammad Abdulrazek]

thank you this is very helpful ,

but how can i make a map to read this plot some this like this :

or even write a number of line above each line ?

[Voss]

@Muhammad Abdulrazek You can use legend.