who to write this function in another way?

I did this function but I didn't want like this long. I try to put in MATLAB Function in simulink

I want like this but I did not where my mistake?

outputvalue = map(sensorValue, low input , high input , low output , high input);

y = map(u, -1 , 1 , 0 , 0.5);

that what I did

function y = fcn(u)
if  u <(-0.9)
    y=0.25;
elseif  u < (-0.8)
    y=0.20;
elseif  u < (-0.6)
    y=0.15;
elseif  u < (-0.4)
    y=0.10;
elseif  u < (-0.2)
    y=0.05;
elseif    u < 0.2
    y=0;
elseif    u < 0.4
    y=0.30;
elseif  u < 0.6
    y=0.35;
elseif  u < 0.8
    y=0.40;
elseif  u < 0.9
    y=0.45;
elseif  u < 1.5
    y=0.50;
else 
    y=1;
    
end 

[KSSV]

u < (-0.8)

can be

u < -0.8

[Mohammad Alhaddad]

i know but I didnot want the second code I want convert to this

outputvalue = map(sensorValue, low input , high input , low output , high input);

y = map(u, -1 , 1 , 0 , 0.5);

Answer 1

[Chunru]

fcn(-5)

ans = 0.2500

fcn(.34)

ans = 0.3000

fcn(4)

ans = 1

function y = fcn(u)
x0 = [-inf  -0.9  -0.8  -0.6  -0.4  -0.2  0.2   0.4   0.6   0.8   0.9   1.5];
y0 = [0.25  0.20   0.15  0.10  0.05  0    0.30  0.35  0.40  0.45  0.50  1  ];
idx = find(u > x0, 1, 'last' );
y = y0(idx);
end 

[Mohammad Alhaddad]

no I did not want put the number I want but values between this numbers input -1:1:100

output 0:1:100

[Chunru]

What do you mean by saying "this numbers input -1:1:100 output 0:1:100" ?

[Mohammad Alhaddad]

the input beween -1 to 1 and Divided into 100 sections. and match with out put from 0 to 1 and Divided into 100 sections.

Answer 2

[Mohammad Alhaddad]

Like this but this in ardino sysem

Chapter 6: Analog input – Arduino to Go

[Chunru]

This looks like a new question and you should have started a new question. The old question has been answered already.

Anyway, the solution to the problem is rather straightforwad:

x = 0:.1:1023;
y = map(x, 0, 1023, 0, 255);
plot(x(1:200), y(1:200));

function y = map(x, in0, in1, out0, out1)
 y = floor((x-in0)/(in1-in0) * (out1-out0)) + out0; 
end

Answer 3

[Steven Lord]

Try using the discretize function.