How to extract data from a file, and form a column vector?

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Sergio 2024-3-18

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https://ww2.mathworks.cn/matlabcentral/answers/2095876-how-to-extract-data-from-a-file-and-form-a-column-vector

评论： Voss 2024-3-19

Take the four files, and run "test.m" in MATLAB. It generates the relative concentrations of Substrate and product as label "SP".

The first experiment gives:

SUBSTRATE (SP first value): 0.98

PRODUCT (SP second value): 2.11

The second generated from test.m gives:

SUBSTRATE: 0.52

PRODUCT: 1.57

The third:

e)

SUBSTRATE: 0.24

PRODUCT: 0.85

and the fourth gives:

SUBSTRATE: 2.38

PRODUCT: 2.71

These are given in the output,

How can I subsbtract these values from the respective y0 values in the test.m output automatically and arrange the difference such as:

r= [ y_0 (first value, first experiment) - SP (first value first experiment,

y_0 (first value, second experiment)- SP (first value second experiment,

y_0 (first value, third experiment)- SP (first value third experiment ,

y_0 (first value, fourth experiment)- SP (first value fourth experiment,

y_0 (second value, first experiment)- SP (second value first experiment ,

y_0 (second value, second experiment)- SP (second value second experiment,

y_0 (second value, third experiment)- SP (second value third experiment ,

y_0 (second value, fourth experiment)- SP (second value fourth experiment ]

These entries are respectively by the output of test:

2-0.98,

1-0.52,

1-0.24,

4-2.38,

1-2.11,

1-1.57,

0-0.85,

1-2.71

These would hence form a vector r=[1.02, 0.48, 0.76, 1.72, ...., -1.71]

Thanks!

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Answer 1

Voss 2024-3-18

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在 MATLAB Online 中打开

See the attached test_modified for one way to do that.

test_modified
ans = 2×1
    0.5249
    1.5751
ans = 2×1
    0.2476
    0.8524
ans = 2×1
    2.3875
    2.7125
r = 1×8
    1.0146    0.4751    0.7524    1.6125   -1.1146   -0.5751   -0.8524   -1.7125

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Sergio 2024-3-19

Thanks!!

Voss 2024-3-19

You're welcome!

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Answer 2

Stephen23 2024-3-18

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2095876-how-to-extract-data-from-a-file-and-form-a-column-vector#answer_1427096

编辑：Stephen23 2024-3-18

在 MATLAB Online 中打开

Note that copy-and-pasting blocks of code like that... is not a generalized approach to writing code. Best avoided.

Rather than doing the computer's job by painstakingly copy-and-paste-and-modifying code like that, let the computer do that simple task by writing a loop. For example:

ym = [2,1;1,1;1,0;4,1];
dt = 0.01;
T  = 1;
k  = [5;1];
SP = nan(size(ym));
for ii = 1:size(ym,1)
    y0 = ym(ii,:);
    [SP(ii,:),~] = enzyme(y0,k,dt,T);
end
V = ym(:)-SP(:)
V = 8×1
    1.0146
    0.4751
    0.7524
    1.6125
   -1.1146
   -0.5751
   -0.8524
   -1.7125