MATLAB: Problems with and/or commands…

anderrorifor

Hey everyone,

I am using an if-condition within a loop. The loop is t=1:100.

The if-condition is

 t>=sz1 && t<=sz2
    ZZ(t)=2;
 elseif t>=sz3 && t<=sz4
    ZZ(t)=2;
 elseif t>=sz5 && t<=sz6
    ZZ(t)=2;
 else 
    ZZ(t)=1;
 end

sz1…sz6 represent number that I have defined earlier.

Now matlab gives me the following errors message: Operands to the and && operators must be convertible to logical scalar values.

What did I do wrong??

Thanks a lot!!

Best Answer

You only need single & operators for what you’re doing.

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MATLAB: Addition of two DNA sequenc

Hi,

There are a couple of minor issues with your implementation that is causing a problem.

Your function is missing an end statement.
Assuming that you wanted to send the ith character of P_DNA1 and P_DNA2 to the function DNA_add, the quotation marks are not needed.
The variable d3 gets overwritten at each iteration of the loop rather than the result of DNA_add being appended to d3.

Here is the modified code which should resolve these issues:

P_DNA1='ACAAGGGTTTAAACCCTTAC';
P_DNA2='TTTTGGGAAATGTGACATAT';
[m n]=size(P_DNA1);
mn=m*n;
d3=[];
for i = 1:mn
      d3 = [d3 DNA_add(P_DNA1(i),P_DNA2(i))];
end
function K = DNA_add(Q1,Q2)
if Q1=='A' && Q2=='A';
    K = 'A';
elseif Q1=='A' && Q2=='G';
    K = 'G';
elseif Q1=='A' && Q2=='C';
    K = 'C';
elseif Q1=='A' && Q2=='T';
    K = 'T';
elseif Q1=='G' && Q2=='A';
    K = 'G';
elseif Q1=='G' && Q2=='G';
    K = 'C';
elseif Q1=='G' && Q2=='C';
    K = 'T';
elseif Q1=='G' && Q2=='T';
    K = 'A';
elseif Q1=='C' && Q2=='A';
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elseif Q1=='C' && Q2=='G';
    K = 'T';
elseif Q1=='C' && Q2=='C';
    K = 'A';
elseif Q1=='C' && Q2=='T';
    K = 'G';
elseif Q1=='T' && Q2=='A';
    K = 'T';
elseif Q1=='T' && Q2=='G';
    K = 'A';
elseif Q1=='T' && Q2=='C';
    K = 'G';
elseif Q1=='T' && Q2=='T';
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end

MATLAB: How to select value

clear
Z=[-4:1:2];
H=[0:1:4];
[xx,yy]=meshgrid(Z,H);
zz=0.4166+0.0456.*yy-0.2343.*xx;
zz(zz>1)=1
zz(zz<0)=0
figure
surf(xx,yy,zz)

Best Answer

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MATLAB: Addition of two DNA sequenc

MATLAB: How to select value

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