Problems in reading large matrix with large empty cells

1 次查看（过去 30 天）
Poulomi Ganguli
Poulomi Ganguli 2021-5-6
编辑： per isakson 2021-5-7
Hello:
I am facing problem in reading a large matrix with header file containing values and missing data/empty cells in each column. A few days ago, I have enquired for similar matrix, which could be read with fixedWidthImportOptions, however with simpler matrix: https://de.mathworks.com/matlabcentral/answers/451154-problems-with-empty-cell-in-a-large-matrix?s_tid=srchtitle
But for this case, matrix dimension are pretty complex with some more values. Could any one pls. suggest how to read in this case, especially for fixing 'VariableWidths'. I am attaching the sample matrix here for your reference.
  3 个评论
显示 1更早的评论
Poulomi Ganguli
Poulomi Ganguli 2021-5-7
I could read upto column 19 using foll. codes. But after this, I am not able to read the values.
opts = fixedWidthImportOptions('NumVariables',36,'DataLines',151,...
'VariableNames',["INDEX" "YEAR" "MN" "HR" "DT" "SLP" "MSLP" "DBT" "WBT" "DPT" "RH" "VP" "DD" "FFF" "AW" "VV" "Cl" "A" "Cm" "A" "Ch" "A" "Dl" "Dm" "Dh" "TC" "h" "c" "a" "Ht" "R/F" "EVP" "DW" "P" "H" "WAT"],...
'VariableWidths',[5 5 3 4 3 6 7 6 6 6 4 5 3 4 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 5 3 3 3 3 3],...
'VariableTypes',repmat("double",1,36));
T = readtable(sprintf('%s%s',fullfile(Data_path),'tab3.txt'),opts);

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

per isakson
per isakson 2021-5-7
编辑：per isakson 2021-5-7
Ran in:
This script reads your sample file
%%
opts = fixedWidthImportOptions('NumVariables',36,'DataLines',4,...
'VariableNames',{'INDEX','YEAR','MN','HR','DT','SLP','MSLP','DBT','WBT','DPT','RH','VP','DD','FFF','AW','VV','Cl','A','Cm','A','Ch','A','Dl','Dm','Dh','TC','h','c','a','Ht','R_F','EVP','DW','P','H','WAT'},...
'VariableWidths',[5,5,3,3,3,7,7,6,6,6,4,5,3,4,3,3,2,3,2,3,2,3,2,3,3,3,3,2,2,3,6,5,3,2,2,5],...
'VariableTypes',repmat("double",1,36));
T = readtable('Test_data.txt', opts );
T
T = 5×36 table
INDEX YEAR MN HR DT SLP MSLP DBT WBT DPT RH VP DD FFF AW VV Cl A Cm A_1 Ch A_2 Dl Dm Dh TC h c a Ht R_F EVP DW P H WAT _____ ____ __ __ __ _____ ______ ____ ____ ____ __ ____ __ ___ __ __ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ____ ___ ___ ___ ___ ___ 42182 1970 1 3 20 987.1 1012.5 15.6 15 14.6 93 16.6 14 4 12 96 9 5 2 2 0 0 9 9 0 7 5 9 1 30 10.5 1.5 NaN NaN NaN NaN 42182 1970 1 3 21 988.8 1014.6 12 11.7 11.4 97 13.5 0 0 6 91 NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN 0.5 0 NaN NaN NaN NaN 42182 1970 1 3 22 990.2 1016.3 9 8.8 8.6 97 11.2 27 4 5 90 NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN 0 0 NaN NaN NaN NaN 42182 1970 1 3 23 990.7 1016.7 9.8 9.4 9 95 11.5 0 0 2 93 0 0 3 2 1 3 0 9 9 5 9 3 2 60 0 0.5 NaN NaN NaN NaN 42182 1970 1 3 24 989.6 1015.7 9 8.6 8.2 94 10.9 14 4 0 93 0 0 0 0 0 0 0 0 0 0 9 0 0 99 0 1.8 NaN NaN NaN NaN
Determine the column widths based on the header line (second line). The widths of the columns " Cl A" differ between header and data. The first and last column must be added determined visually.
%%
hdr = 'INDEX YEAR MN HR DT ...SLP ..MSLP ..DBT ..WBT ..DPT .RH ..VP DD FFF AW VV Cl A Cm A Ch A Dl Dm Dh TC h c a Ht ..R/F .EVP DW P H .WAT';
pos = strfind( hdr, ' ' );
dpos = diff(pos)
dpos = 1×34
5 3 3 3 7 7 6 6 6 4 5 3 4 3 3 3 2 3 2 3 2 3 3 3 3 2 2 2 3 6
A ruler like this is useful, especially if the header line is not as good as this one.
%%
chr = '42182 1970 01 03 20 0987.1 1012.5 15.6 15.0 14.6 093 16.6 14 004 12 96 9 5 2 2 0 0 9 9 0 7 5 9 1 30 010.5 01.5';
db_ruler( chr )
1 2 3 4 5 6 7 8 9 0 1 2 123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890 42182 1970 01 03 20 0987.1 1012.5 15.6 15.0 14.6 093 16.6 14 004 12 96 9 5 2 2 0 0 9 9 0 7 5 9 1 30 010.5 01.5

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 High Dynamic Range Images 的更多信息

标签

产品


版本

R2019b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by