MATLAB: How to append a semicolon after every 4 integers

fscanfmatrix arrayserial

I currenty have this code:

C = serial('COM9'); %#ok<SERIAL>
fopen(C);
L = reshape(fscanf(C,'%f, '),[4,4])

And it outputs the following:

L =
   74.8000   74.8000   74.8000   74.8000
   74.7000   74.8000   74.8000   74.5000
   74.7000   74.3000   74.5000   74.7000
   74.7000   74.7000   74.7000   74.5000

How can I can matlab to return the above data like this? (with the 2 brackets and semicolons)

L =
  [  74.8000   74.8000   74.8000   74.8000;
   74.7000   74.8000   74.8000   74.5000;
   74.7000   74.3000   74.5000   74.7000;
   74.7000   74.7000   74.7000   74.5000 ]

I need it to be this way so that I can plot the data using a grid.

Thank you in advance.

Best Answer

regexprep(mat2str(L), ';', ';\n')

I need it to be this way so that I can plot the data using a grid.

No you do not, not unless you have some external software that needs exactly that format. MATLAB is happy with the L that you already got.

Related Solutions

MATLAB: Improving data averaging in a loop (is too slow)

Here is an outline of how you could do this without loops:

Convert the date vectors to date numbers using datenum. Note datenum accepts a matrix of date vectors. Call this dtn.
Create a vector of date numbers that represent the bin edges of the times that you want to group together. This is where you define how many seconds the intervals have. Call this edg.
Use histcounts or histc to count the dtn within the bins defined by edg. Call this cnt.
Use mat2cell to split the data into those blocks defined by cnt. Only split along the first dimension, the columns can stay together. Call this spl.
Use cellfun and mean to calculate the mean of the data in spl. Note that you must specify mean's second argument, in case there is only one row of data in some cell, which means you will need an anonymous function .
Concatenate it all back together into a numeric array. You could use vertcat and cell array expansion to generate a comma separated list.

You should now have a matrix of the mean values, without any loops at all. This should be much faster than calculating the mean in nested loops. It could be implemented like this:

SECONDS_SCAN = 4;
TIME = [...
    2007, 4, 6, 13, 50, 33;...
    2007, 4, 6, 13, 50, 36;...
    2007, 4, 6, 13, 50, 38;...
    2007, 4, 6, 13, 50, 40;...
    2007, 4, 6, 13, 50, 42];
ATOT = [...   
    30.2000, 30.2000, 29.9000, 29.9000, 29.9000, 29.9000, 29.4000;...
    30.2000, 29.9000, 29.9000, 29.7000, 29.7000, 29.4000, 29.9000;...
    29.9000, 29.9000, 29.9000, 29.9000, 29.7000, 29.7000, 29.4000;...
    30.4000, 30.2000, 29.9000, 29.7000, 29.4000, 29.9000, 29.7000;...
    30.2000, 29.9000, 29.9000, 29.7000, 29.7000, 29.4000, 29.9000];
dtn = datenum(TIME)*(24*60*60);
edg = min(dtn):SECONDS_SCAN:SECONDS_SCAN+1+max(dtn);
cnt = histc(dtn,edg);
spl = mat2cell(ATOT,cnt(1:end-1),size(ATOT,2));
out = cellfun(@(m)mean(m,1),spl, 'UniformOutput',false);
out = vertcat(out{:});
out =
       30.2    30.05     29.9     29.8     29.8    29.65    29.65
       30.15   30.05     29.9     29.8     29.55   29.8     29.55
       30.2    29.9      29.9     29.7     29.7    29.4     29.9

MATLAB: How to put a condition into a specific column for matlab

This should get you started, just play around with the logical conditions and character concatenation until you get what you want:

A = csvread('test1.txt');
B = A>1000;
X1 = all(B(:,1:3),2);
X2 = any(B(:,1:2),2);
C1 = {'','PowerGrip'};
C2 = {'','PrecisionGrip'};
[num2str(A),char(strcat({' '},C1(1+X1),C2(1+X2)))]

which displays this in the command window:

ans =
    10      13       8      16
     9      18      21      41
     4       5      26       1
     7      48       6      48
    10      11      36      14
     8      21       8      25
...
    44      51      32      45
    37      48      48      52
    50      58      40      29
    40      51      52      46
    47      81      55      18
    46      53      54      47
    48      77      51      36
    53      78      49      45
    52      91      53      44
    52     100      51      46
    48      93      54      47
    55      98      52      59
    51      97      57      49
    47     100      54      68
    55     130      52      48
   286     177      56      63
 33240   56129   67683      92 PowerGripPrecisionGrip
 79617   64019   67522      92 PowerGripPrecisionGrip
 66281   67357   63916      97 PowerGripPrecisionGrip
 71727   67721   64136      97 PowerGripPrecisionGrip
 79381   69925   67599      95 PowerGripPrecisionGrip
 74152       0   65272      92 PrecisionGrip
 74347       0   65709      95 PrecisionGrip
 82034      13   60512      94 PrecisionGrip
 76831   71759   67628      91 PowerGripPrecisionGrip
 79574     627   67594      95 PrecisionGrip
 74439      10   65255      95 PrecisionGrip
 79481      52   62760      99 PrecisionGrip
 79491      24   65629      94 PrecisionGrip
 79445      40   62636      88 PrecisionGrip
 79705      25   68068      62 PrecisionGrip
 77177   56306   67258      53 PowerGripPrecisionGrip
 82089      23   68282      66 PrecisionGrip
 79500      11   68059      61 PrecisionGrip
 76983   14490   69494      92 PowerGripPrecisionGrip
 82012     352   67713      95 PrecisionGrip
 79532      23   73521      94 PrecisionGrip
 89865   85677   62293     101 PowerGripPrecisionGrip
 55462    5468    6932      75 PowerGripPrecisionGrip
   107     216      56      56
    96     188      57      48
    86     157      54      53
    51     111      51      33
    50     117      53      45
    49     108      55      26
    56     106      51      44
    51     104      50      36
    51     106      44      47
    41     107      53      45
    42     102      49      28
    30      97      51      49
    42     105      52       6
    43      85      52      49
    42     103      51      29
    41      99      33      44
    21     104      47      45
    45     104      37      28
...

Best Answer

Related Solutions

MATLAB: Improving data averaging in a loop (is too slow)

MATLAB: How to put a condition into a specific column for matlab

Related Question