MATLAB: Incorrect use of ‘=’ operator. To assign a value to a variable, use ‘=’. To compare values for equality, use ‘==’.

error

Hello everyone,
I'm getting the aformentioned error for the RL2 variable but I do not want to compare values for equality. I just want to put RL2 = RL/2. This problem persists even when I remove that line of code. The same problem occurs for H matrix when I remove the line of code for RL2 and the same occurs for R when I remove the line of code for H matrix. Why is this happening?
Thanks
clear all
close all
clc
R1 = 0; R2 = 100; R3 = 125; R4 = 150; R5 = 200; R6 = 250; R7 = 500; R8 = 1000;
R9 = 2000;
L1 = 0; L2 = 2.5; L3 = 5; L4 = 7.5; L5 = 10; L6 = 12.5; L7 = 15; L8 = 17.5; L9 = 20; 
RL = [R1*L1 R2*L1 R3*L1 R4*L1 R5*L1 R6*L1 R7*L1 R8*L1 R9*L1;
    R1*L2 R2*L2 R3*L2 R4*L2 R5*L2 R6*L2 R7*L2 R8*L2 R9*L2;
    R1*L3 R2*L3 R3*L3 R4*L3 R5*L3 R6*L3 R7*L3 R8*L3 R9*L3;
    R1*L4 R2*L4 R3*L4 R4*L4 R5*L4 R6*L4 R7*L4 R8*L4 R9*L4;
    R1*L5 R2*L5 R3*L5 R4*L5 R5*L5 R6*L5 R7*L5 R8*L5 R9*L5;
    R1*L6 R2*L6 R3*L6 R4*L6 R5*L6 R6*L6 R7*L6 R8*L6 R9*L6;
    R1*L7 R2*L7 R3*L7 R4*L7 R5*L7 R6*L7 R7*L7 R8*L7 R9*L7;
    R1*L8 R2*L8 R3*L8 R4*L8 R5*L8 R6*L8 R7*L8 R8*L8 R9*L8;
    R1*L9 R2*L9 R3*L9 R4*L9 R5*L9 R6*L9 R7*L9 R8*L9 R9*L9;
    
RL2 = (RL/2);
H = [73.00 73.00 73.00 73.00 73.00 73.00 73.00 73.00 73.00;
     70.17 70.17 70.17 70.17 70.17 70.17 70.17 70.17 70.17; 
     67.34 67.34 67.34 67.34 67.34 67.34 67.34 67.34 67.34; 
     64.19 64.19 64.19 64.19 64.19 64.19 64.19 64.19 64.19;
     61.36 61.36 61.36 61.36 61.36 61.36 61.36 61.36 61.36;
     58.53 58.53 58.53 58.53 58.53 58.53 58.53 58.53 58.53;
     55.38 55.38 55.38 55.38 55.38 55.38 55.38 55.38 55.38;
     49.72 49.72 49.72 49.72 49.72 49.72 49.72 49.72 49.72;
     43.74 43.74 43.74 43.74 43.74 43.74 43.74 43.74 43.74;
     37.76 37.76 37.76 37.76 37.76 37.76 37.76 37.76 37.76; 
     32.09 32.09 32.09 32.09 32.09 32.09 32.09 32.09 32.09;
     23.60 23.60 23.60 23.60 23.60 23.60 23.60 23.60 23.60;
     15.73 15.73 15.73 15.73 15.73 15.73 15.73 15.73 15.73;
     7.87  7.87 7.87 7.87 7.87 7.87 7.87 7.87 7.87;
     0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00];
 
 R = [R1 R2 R3 R4 R5 R6 R7 R8 R9;
     R1 R2 R3 R4 R5 R6 R7 R8 R9;
     R1 R2 R3 R4 R5 R6 R7 R8 R9;
     R1 R2 R3 R4 R5 R6 R7 R8 R9;
     R1 R2 R3 R4 R5 R6 R7 R8 R9;
     R1 R2 R3 R4 R5 R6 R7 R8 R9;
     R1 R2 R3 R4 R5 R6 R7 R8 R9;
     R1 R2 R3 R4 R5 R6 R7 R8 R9;
     R1 R2 R3 R4 R5 R6 R7 R8 R9;
     R1 R2 R3 R4 R5 R6 R7 R8 R9;
     R1 R2 R3 R4 R5 R6 R7 R8 R9;
     R1 R2 R3 R4 R5 R6 R7 R8 R9;
     R1 R2 R3 R4 R5 R6 R7 R8 R9;
     R1 R2 R3 R4 R5 R6 R7 R8 R9;
     R1 R2 R3 R4 R5 R6 R7 R8 R9];
 
contourf(RL2,R,H)
k = colorbar;
cmap = colormap;
ax = gca;
ax.Color = cmap(1, :);
k.Label.String = 'Relative Humidity (%)';
xlabel('Length (\mum)')
ylabel('Radius (\mum)')

Best Answer

RL2 = (RL/2;
That is an incomplete expression that would cause problems for what follows.
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