# I need to replace some values with NaN and some values with zeros

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Moustafa Abedel Fattah 2023 年 2 月 2 日
コメント済み: Voss 2023 年 2 月 9 日
Hi every one can help
in annexed figure I have table in left handside gives its corresponding curves and I want to replace some values in z1, z2, and z3 to be NaN and replace some values of zb to be zeros by using Matlab If -Condition ro get the right handside that gives the corresponding curves
M. Dahab
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Arif Hoq 2023 年 2 月 2 日
what is the condition?
if gBt >= any value
z1= ????
elseif gBt == any value
z2= ????
end
Moustafa Abedel Fattah 2023 年 2 月 3 日
Can you please use the excel file attached with Voss answer and write the complite code

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### 回答 (1 件)

Voss 2023 年 2 月 2 日

I've entered the values from your left-hand table into Excel and saved the attached xlsx file.
Read the file into a matrix and plot z1, z2, z3, and zb vs xc:
figure();
plot(M(:,1),M(:,3:end))
set(gca(),'YDir','reverse');
Modify the matrix by replacing certain elements with 0 or NaN:
% where gBt is not close to 0.808269 ...
idx = abs(M(:,2) - 0.808269) > 1e-6;
% ... replace z1, z2, z3 with NaN ...
M(idx,3:end-1) = NaN;
% ... and replace zb with 0
M(idx,end) = 0;
Plot again, with new M for comparison:
figure();
plot(M(:,1),M(:,3:end))
set(gca(),'YDir','reverse');
You can use similar steps on your data.
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Moustafa Abedel Fattah 2023 年 2 月 8 日

I mean by "swap" as a Matlab order to clean the cell value and then replace with another value if satisfied the condition "if"
thanks for your paying me attention
Voss 2023 年 2 月 9 日
You can substitute "another value" you want to use in place of the NaN in the code above.

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