MATLAB: The expression to the left of the equals sign is not a valid target for an assignment

errorif statementMATLABmatrices

I wondered if anyone could explain what is going wrong here? the error is present for every single line with "Ta" in it. Is there an alternative technique I could use instead of these if statements?
for Ta=1:39 for Tr=1:44
Hc=4;
 if Ta=0
       Pswv=0
       elseif Ta=1
       Pswv=6.5;
       elseif Ta=2
       Pswv=6.9;
       elseif Ta=3
       Pswv=7.7;
       elseif Ta=4
       Pswv=8.4;
       elseif Ta=5
       Pswv=9.0;
       elseif Ta=5
       Pswv=9.7;
       elseif Ta=6
       Pswv=10.3;
       elseif Ta=7
       Pswv=11.0;
       elseif Ta=8
       Pswv=11.6;
       elseif Ta=9
       Pswv=12.3;
       elseif Ta=10
       Pswv=13.1;
       elseif Ta=11
       Pswv=14.0;
       elseif Ta=12
       Pswv=14.8;
       elseif Ta=13
       Pswv=15.8;
       elseif Ta=14
       Pswv=16.8;
       elseif Ta=15
       Pswv=17.7;
       elseif Ta=16
       Pswv=19.4;
       elseif Ta=17
       Pswv=21.0;
       elseif Ta=18
       Pswv=23.0;
       elseif Ta=19
       Pswv=24.0;
       elseif Ta=20
       Pswv=25.0;
       elseif Ta=21
       Pswv=26.5;
       elseif Ta=22
       Pswv=28.1;
       elseif Ta=23
       Pswv=29.6;
       elseif Ta=24
       Pswv=31.4;
       elseif Ta=25
       Pswv=33.3;
       elseif Ta=26
       Pswv=35.0;
       elseif Ta=27
       Pswv=38.0;
       elseif Ta=28
       Pswv=41.0;
       elseif Ta=29
       Pswv=43.7;
       elseif Ta=30
       Pswv=45.9;
       elseif Ta=31
       Pswv=48.1;
       elseif Ta=32
       Pswv=50.8;
       elseif Ta=33
       Pswv=53.5;
       elseif Ta=34
       Pswv=56.2;
       elseif Ta=35
       Pswv=59.9;
       elseif Ta=36
       Pswv=63.6;
       elseif Ta=37
       Pswv=65.6;
       elseif Ta=38
       Pswv=69.3;
       elseif Ta=39
       Pswv=74.5;
       elseif Ta=40
       Pswv=76.2;
   end

Best Answer

You mean:
if Ta == 0
The "==" is the comparison, while "=" is an assignment.
Hints: After for Ta=1:39 the case "if Ta==0" is not possible. But a nicer version of the code might be:
PswvPool = [6.5, 6.9, 7.7, 8.4, ...]  etc
for Ta = 1:39
  Pswv = PswvPool(Ta);
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