How to use if statement in cells

Question

Abirami 2015-2-2

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/174416-how-to-use-if-statement-in-cells

编辑： Stephen23 2015-2-19

Hello I have doubts in using if condition in matlab.I have to perform the following operation in a cell.

     Final={ S1 if B{i}=11
             S1 if B{i}=10
             S2 if B{i}=01
             S2 if B{i}=00

I have the 2 bit binary values as a 128x17 cell. How to perform this and create a new matrix Z where i get the values of S1 and S2.

     B= 00 10 11 10 11 
        01 01 01 01 11 
        10 00 01 00 01 
        10 10 01 01 11 
        10 10 10 00 10

and if

For each binary value, the corresponding S value should be present.So my Z would be

      Z = s2 s1 s1 s1 s1   
          s2 s2 s2 s2 s1
          s1 s2 s2 s2 s2
          s1 s1 s2 s2 s1
          s1 s1 s1 s2 s1
    ie Z= 96 21 21 21 21 
          85 85 85 85 23 
          28 78 78 78 78
          25 25 65 65 25
          43 43 43 76 43

ie; with the values of S1 and S2, the data in B is to be replaced.please help. thanks in advance

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Jan 2015-2-2

在 MATLAB Online 中打开

What does this mean:

Final={ S1 if B{i}=11
        S1 if B{i}=10
        S2 if B{i}=01
        S2 if B{i}=00

Using a personally invented syntax is useful if you explain the meaning. E.g. what is "01"? Is this a [1x2] CHAR vector or a [1x2] uint8 or logical vector? What are "2 bit binary values" and how do you store them? Where does the "128x17 cell" occur in your code? What type do S1 and S2 have?

Currently a reader have to guess to many details.

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Stephen23 2015-2-2

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/174416-how-to-use-if-statement-in-cells#answer_166700

编辑：Stephen23 2015-2-2

在 MATLAB Online 中打开

It is not clear exactly what format your "binary" data are in, I assumed that they are strings. This script creates the matrix Z as you indicate:

B = {'00','10','11','10','11';...
     '01','01','01','01','11';...
     '10','00','01','00','01';...
     '10','10','01','01','11';...
     '10','10','10','00','10'};
S1 = [21;23;28;25;43];
S2 = [96;85;78;65;76];
%
C = cellfun(@bin2dec,B)>1.5;
[r,~] = find(C);
Z(C) = S1(r);
[r,~] = find(~C);
Z(~C) = S2(r);
Z = reshape(Z,size(C))

When I run the script, it display this in my command window:

Z =
  21    21    21    21
  85    85    85    23
  78    78    78    78
  25    65    65    25
  43    43    76    43

EDIT: For slightly more compact code, this is equivalent:

C = cellfun(@bin2dec,B)>1.5;
Z(C) = S1(1+rem(find(C)-1,size(C,1)));
Z(~C) = S2(1+rem(find(~C)-1,size(C,1)));
Z = reshape(Z,size(C))

3 个评论
显示 1更早的评论隐藏 1更早的评论

Abirami 2015-2-19

编辑：Abirami 2015-2-19

Hello sir, When i executed it for an even greater cell, the resulting cell had zeroes in the first row for values 10 and 11...Also why is '>1.5' used?Please help thanks in advance....

Stephen23 2015-2-19

编辑：Stephen23 2015-2-19

Which "resulting cell" do you mean? Do you mean the output Z, which is not a cell array, but rather a numeric array ? If this is the case, then please add a comment showing the input values that caused these zeros to occur. I can't read minds, and I don't know what your data looks like.

The code X>1.5 compares whatever compares X with 1.5, and returns a true value for every element of X is greater than 1.5. This is used to allocate the elements of input array B to either S1 or S2.

请先登录，再进行评论。