CODEWITHSUNDEEP
arraysstringmatlabchar
Laurengineer
Laurengineer

Reputation: 747

Convert a string in char to array in MATLAB

I have a list of strings in a char array:

'gvs(0.000000000000000e+000, 1.601985139535780e+002)'
'gvs(-5.000000000000000e-005, 1.365231866954370e+002)'
'gvs(-1.000000000000000e-004, 1.169431404340180e+002)'
'gvs(-5.000000000000000e-004, 3.187711314514890e+001)'
'gvs(-2.000000000000000e-004, 8.589930648472340e+001)'

Which I am trying to convert to an array of just the numbers (ignoring gvs, the comma and the brackets), but I can't quite work out what I'm doing wrong?

cols = length(Variables) + length(Parameters);
% currently unused
rows = length(Results);

for a = 1:rows;
    Res(a,:) = sscanf ((Results{a,1}(1,:)),'%*s %f %f');
end

I've also tried textscan, but I can't get that to work right either 

for a = 1:rows;
    Res = cell (textscan ((Results{a,1}(1,:)),'%*s %f %f','Delimiter', {'(',' '},'MultipleDelimsAsOne',1));
end

Any help much appreciated!

Thanks

Upvotes: 0

Views: 384

Answers (3)

Rody Oldenhuis
Rody Oldenhuis

Reputation: 38032

Considering that your string is almost in MATLAB-array compatible format, you could commit a sin and use evalc:

>> s = {
    'gvs( 0.000000000000000e+000, 1.601985139535780e+002)'
    'gvs(-5.000000000000000e-005, 1.365231866954370e+002)'
    'gvs(-1.000000000000000e-004, 1.169431404340180e+002)'
    'gvs(-5.000000000000000e-004, 3.187711314514890e+001)'
    'gvs(-2.000000000000000e-004, 8.589930648472340e+001)'};

>> C = evalc(['[' regexprep([s{:}], {'gvs\(' '\)'}, {'' ';'}) ']'])

ans =
                         0    1.601985139535780e+002
   -5.000000000000000e-005    1.365231866954370e+002
   -1.000000000000000e-004    1.169431404340180e+002
   -5.000000000000000e-004    3.187711314514890e+001
   -2.000000000000000e-004    8.589930648472340e+001

Upvotes: 0

Oleg
Oleg

Reputation: 10676

Assuming you have a char array (not a cellstring):

s = ['gvs( 0.000000000000000e+000, 1.601985139535780e+002)'
     'gvs(-5.000000000000000e-005, 1.365231866954370e+002)'
     'gvs(-1.000000000000000e-004, 1.169431404340180e+002)'
     'gvs(-5.000000000000000e-004, 3.187711314514890e+001)'
     'gvs(-2.000000000000000e-004, 8.589930648472340e+001)']

Then you can simply textscan():

data = textscan(s','gvs(%f%f)','CollectOutput',1,'Delimiter',',');
data = data{1}
data =
         0  160.1985
   -0.0001  136.5232
   -0.0001  116.9431
   -0.0005   31.8771
   -0.0002   85.8993

If s is a cellstring, then before calling textscan, convert to char():

s = char(s);

Upvotes: 2

Mohsen Nosratinia
Mohsen Nosratinia

Reputation: 9864

Replace 

Res(a,:) = sscanf ((Results{a,1}(1,:)),'%*s %f %f');

with

Res(a,:) = sscanf ((Results{a,1}(1,:)),'gvs(%f, %f)');

Upvotes: 2

Related Questions